diff --git a/bus_protocols/isotp_handler.cpp b/bus_protocols/isotp_handler.cpp
index 1bc51fd..db05824 100644
--- a/bus_protocols/isotp_handler.cpp
+++ b/bus_protocols/isotp_handler.cpp
@@ -9,7 +9,6 @@ ISOTP_HANDLER::ISOTP_HANDLER()
     processAll = false;
     lastSenderBus = 0;
     lastSenderID = 0;
-    issuedMultiFrame = false;
 
     modelFrames = MainWindow::getReference()->getCANFrameModel()->getListReference();
 
@@ -62,7 +61,6 @@ void ISOTP_HANDLER::sendISOTPFrame(int bus, int ID, QVector<unsigned char> data)
 
     if (data.length() < 8)
     {
-        issuedMultiFrame = false;
         frame.bus = bus;        
         frame.ID = ID;
         if (ID > 0x7FF) frame.extended = true;
@@ -75,7 +73,6 @@ void ISOTP_HANDLER::sendISOTPFrame(int bus, int ID, QVector<unsigned char> data)
     }
     else //need to send a multi-part ISO_TP message - Respects timing and frame number based flow control
     {
-        issuedMultiFrame = true;
         frame.bus = bus;
         frame.ID = ID;
         if (ID > 0x7FF) frame.extended = true;
@@ -194,6 +191,7 @@ void ISOTP_HANDLER::processFrame(const CANFrame &frame)
         msg.len = frameLen;
         msg.data.reserve(frameLen);
         msg.timestamp = frame.timestamp;
+        msg.isMultiframe = false;
         if (useExtendedAddressing) for (int j = 0; j < frameLen; j++) msg.data.append(frame.data[j+2]);
         else for (int j = 0; j < frameLen; j++) msg.data.append(frame.data[j+1]);
         //qDebug() << "Emitting single frame ISOTP message";
@@ -206,7 +204,7 @@ void ISOTP_HANDLER::processFrame(const CANFrame &frame)
         msg.ID = ID;
         msg.timestamp = frame.timestamp;
         msg.isReceived = frame.isReceived;
-        issuedMultiFrame = true;
+        msg.isMultiframe = true;
         frameLen = frameLen << 8;
         if (useExtendedAddressing)
         {
@@ -224,10 +222,11 @@ void ISOTP_HANDLER::processFrame(const CANFrame &frame)
             msg.data.reserve(frameLen);
             for (int j = 0; j < 6; j++) msg.data.append(frame.data[2 + j]);
         }
+        msg.lastSequence = -1;
         messageBuffer.append(msg);
         //The sending ID is set to the last ID we used to send from this class which is
         //very likely to be correct. But, caution, there is a chance that it isn't. Beware.
-        if (issueFlowMsgs && lastSenderID > 0 && issuedMultiFrame)
+        if (issueFlowMsgs && lastSenderID > 0)
         {
             CANFrame outFrame;
             outFrame.bus = lastSenderBus;
@@ -252,6 +251,7 @@ void ISOTP_HANDLER::processFrame(const CANFrame &frame)
             }
         }
         if (!pMsg) return;
+        if (!pMsg->isMultiframe) return; //if we didn't get a frame type 1 (start of multiframe) first then ignore this frame.
         ln = pMsg->len - pMsg->data.count();
         //offset = pMsg->data.count();
         if (useExtendedAddressing)
@@ -267,8 +267,7 @@ void ISOTP_HANDLER::processFrame(const CANFrame &frame)
         if (pMsg->len <= pMsg->data.count())
         {
             //qDebug() << "Emitting multiframe ISOTP message";
-            issuedMultiFrame = false;
-            emit newISOMessage(*pMsg);
+            checkNeedFlush(pMsg->ID);
         }
         break;
     case 3: //flow control messages
@@ -306,9 +305,18 @@ void ISOTP_HANDLER::checkNeedFlush(uint64_t ID)
         if (messageBuffer[i].ID == ID)
         {
             //used to pass by reference but now newISOMessage should pass by value which makes it easier to use cross thread
-            //qDebug() << "Flushing a partial frame";
+            if (messageBuffer[i].ID > 0x600 && messageBuffer[i].ID < 0x630)
+            {
+            if (messageBuffer[i].len <= messageBuffer[i].data.count())
+            {
+                qDebug() << "Flushing full frame" << QString::number(messageBuffer[i].ID, 16) << "  " << messageBuffer[i].len << "  " << messageBuffer[i].data.count();
+            }
+            else
+            {
+                qDebug() << "Flushing a partial frame " << QString::number(messageBuffer[i].ID, 16) << "  " << messageBuffer[i].len << "  " << messageBuffer[i].data.count();
+            }
+            }
             emit newISOMessage(messageBuffer[i]);
-            issuedMultiFrame = false;
             messageBuffer.removeAt(i);
             return;
         }
diff --git a/bus_protocols/isotp_handler.h b/bus_protocols/isotp_handler.h
index 1aa4652..611f63a 100644
--- a/bus_protocols/isotp_handler.h
+++ b/bus_protocols/isotp_handler.h
@@ -46,7 +46,6 @@ private:
     int framesUntilFlow;
     bool processAll;
     bool issueFlowMsgs;
-    bool issuedMultiFrame;
     QTimer frameTimer;
     uint32_t lastSenderID;
     uint32_t lastSenderBus;
diff --git a/bus_protocols/isotp_message.h b/bus_protocols/isotp_message.h
index 66ed9df..f2d4c85 100644
--- a/bus_protocols/isotp_message.h
+++ b/bus_protocols/isotp_message.h
@@ -11,6 +11,8 @@ public:
     bool isReceived;
     int len; //# of bytes this message should have (as reported)
     int actualSize; //# we actually got
+    int lastSequence;
+    bool isMultiframe;
     QVector<unsigned char> data;
     uint64_t timestamp;
 };
diff --git a/bus_protocols/uds_handler.cpp b/bus_protocols/uds_handler.cpp
index 4387d34..5508800 100644
--- a/bus_protocols/uds_handler.cpp
+++ b/bus_protocols/uds_handler.cpp
@@ -50,7 +50,8 @@ static QVector<CODE_STRUCT> UDS_SERVICE_DESC = {
     {0x14, "CLEAR_DIAG", "Clear diagnostic trouble codes"},
     {0x19, "READ_DTC", "Read diagnostic trouble codes"},
     {0x1A, "GMLAN_READ_DIAGNOSTIC_ID", "GMLAN - Read diagnostics ID"},
-    {0x20, "RETURN_TO_NORMAL", "Return to normal mode"},
+    {0x20, "RETURN_TO_NORMAL", "Return to normal mode"},    
+    {0x21, "READ_BY_LOCALID", "Read data by Local ID"},
     {0x22, "READ_BY_ID", "Read data by ID"},
     {0x23, "READ_BY_ADDR", "Read data by address"},
     {0x24, "READ_SCALING_ID", "Read scaling data by ID"},
@@ -184,6 +185,10 @@ void UDS_HANDLER::gotISOTPFrame(ISOTP_MESSAGE msg)
     udsMsg.isReceived = msg.isReceived;
     udsMsg.timestamp = msg.timestamp;
     udsMsg.actualSize = msg.actualSize;
+    udsMsg.service = 0;
+    udsMsg.subFunc = 0;
+    udsMsg.subFuncLen = 0;
+    udsMsg.isErrorReply = false;
     udsMsg.len = msg.len;
     if (msg.data.length() > 0) {
         udsMsg.service = msg.data.at(0);
diff --git a/re/isotp_interpreterwindow.cpp b/re/isotp_interpreterwindow.cpp
index 970d1a1..3aeb8fc 100644
--- a/re/isotp_interpreterwindow.cpp
+++ b/re/isotp_interpreterwindow.cpp
@@ -61,7 +61,21 @@ void ISOTP_InterpreterWindow::showEvent(QShowEvent* event)
 {
     QDialog::showEvent(event);
     readSettings();
+
+    QProgressDialog progress(qApp->activeWindow());
+    progress.setWindowModality(Qt::WindowModal);
+    progress.setLabelText("Analyzing Frames...");
+    progress.setCancelButton(nullptr);
+    progress.setRange(0,0);
+    progress.setMinimumDuration(0);
+    progress.show();
+
+    qApp->processEvents();
+
     decoder->updatedFrames(-2);
+
+    progress.cancel();
+
     installEventFilter(this);
 }
 
@@ -134,7 +148,7 @@ void ISOTP_InterpreterWindow::filterAll()
     for (int i = 0 ; i < ui->listFilter->count(); i++)
     {
         ui->listFilter->item(i)->setCheckState(Qt::Checked);
-        idFilters[ui->listFilter->item(1)->text().toInt(nullptr, 16)] = true;
+        //idFilters[ui->listFilter->item(i)->text().toInt(nullptr, 16)] = true;
     }
 }
 
@@ -143,7 +157,7 @@ void ISOTP_InterpreterWindow::filterNone()
     for (int i = 0 ; i < ui->listFilter->count(); i++)
     {
         ui->listFilter->item(i)->setCheckState(Qt::Unchecked);
-        idFilters[ui->listFilter->item(1)->text().toInt(nullptr, 16)] = false;
+        //idFilters[ui->listFilter->item(i)->text().toInt(nullptr, 16)] = false;
     }
 }
 
diff --git a/re/udsscanwindow.cpp b/re/udsscanwindow.cpp
index 3db172c..081cfa7 100644
--- a/re/udsscanwindow.cpp
+++ b/re/udsscanwindow.cpp
@@ -362,13 +362,13 @@ void UDSScanWindow::gotUDSReply(UDS_MESSAGE msg)
 
     id = msg.ID;
 
-    qDebug() << "UDS message ID " << msg.ID << "  service: " << msg.service << " subfunc: " << msg.subFunc;
+    qDebug() << "UDS message ID " << QString::number(msg.ID,16) << "  service: " << QString::number(msg.service, 16) << " subfunc: " << QString::number(msg.subFunc, 16);
 
     if ((id == (uint32_t)(sentFrame.ID + offset)) || ui->cbAllowAdaptiveOffset->isChecked())
     {
         serviceShortName = udsHandler->getServiceShortDesc(sentFrame.service);
         if (serviceShortName.length() < 3) serviceShortName = QString::number(sentFrame.service, 16);
-        if (msg.service == 0x40 + sendingFrames[currIdx].service)
+        if (msg.service == (0x40 + sendingFrames[currIdx].service) )
         {
             setupNodes(id);
 
@@ -385,7 +385,7 @@ void UDSScanWindow::gotUDSReply(UDS_MESSAGE msg)
             nodeSubFunc->setForeground(0, QBrush(Qt::darkGreen));
             gotReply = true;
         }
-        else if ( msg.isErrorReply && msg.service == sendingFrames[currIdx].service)
+        else if ( msg.isErrorReply && (msg.service == sendingFrames[currIdx].service) )
         {
             if (msg.data.length())
             {