diff --git a/coprocessorjs.c b/coprocessorjs.c
index b2b5443..56cb380 100644
--- a/coprocessorjs.c
+++ b/coprocessorjs.c
@@ -225,6 +225,7 @@ void readSerialPort(char* output) {
     
     // make sure output variable is clear
     memset(output, '\0', MAX_RECEIVE_SIZE);
+    memset(tempOutput, '\0', MAX_RECEIVE_SIZE);
 
     bool done = false;
     long int totalByteCount = 0;
@@ -326,7 +327,7 @@ void readSerialPort(char* output) {
 
             #ifdef DEBUGGING
 
-                writeSerialPortDebug(boutRefNum, "done building temp output\n");
+                writeSerialPortDebug(boutRefNum, "done building temp output");
                 writeSerialPortDebug(boutRefNum, tempOutput);
 
                 // char debugOutput[255];
@@ -343,7 +344,7 @@ void readSerialPort(char* output) {
     }
 
     // attach the gathered up output from the buffer to the output variable
-    strncat(output, tempOutput, totalByteCount);
+    memcpy(output, tempOutput, totalByteCount);
 
     #ifdef DEBUGGING
         writeSerialPortDebug(boutRefNum, "coprocessor.readSerialPort complete, output:");
diff --git a/dist/MessagesForMacintosh.dsk b/dist/MessagesForMacintosh.dsk
index 46da517..5617c60 100644
Binary files a/dist/MessagesForMacintosh.dsk and b/dist/MessagesForMacintosh.dsk differ
diff --git a/dist/MessagesForMacintosh.zip b/dist/MessagesForMacintosh.zip
index ebd5f3d..433764a 100644
Binary files a/dist/MessagesForMacintosh.zip and b/dist/MessagesForMacintosh.zip differ
diff --git a/nuklear_app.c b/nuklear_app.c
index c708930..c17633d 100644
--- a/nuklear_app.c
+++ b/nuklear_app.c
@@ -17,6 +17,10 @@
 
 // based on https://github.com/mr21/strsplit.c/blob/master/strsplit.c
 static char** _strsplit( const char* s, const char* delim, int* nb ) {
+
+    #ifdef DEBUG_FUNCTION_CALLS
+        writeSerialPortDebug(boutRefNum, "DEBUG_FUNCTION_CALLS: _strsplit");
+    #endif
     void* data;
     char* _s = ( char* )s;
     const char** ptrs;