Resolving Assert failure before Main execution

//MyClass.cpp
MyClass accessClass;

MyClass::MyClass()
{
    loopRuning = true;   //type bool
    deviceHandle = NULL; //type unsigned long
    //ResetDevice();     //temporarily commented out to assist in debuging
    opMode = -1;         // type int
    targetMsg = -1;      //type int
    hasDevice = false;   //type bool
    isRunning = false;   //type bool
    msgFound = false;    //type bool

    msgCount = 0;        //type WORD (unsigned short)
}

The assertion failure occurs after MyClass constructor exits before line 1 of int main(array<System::String ^> ^args) is ever called. No pointers or arrays appear to be initialized, called, or referenced up to this point.

_ASSERTE(_CrtIsValidHeapPointer(pUserData))

@ _msize_dbg(void *pUserData, int nBlockUse) in dbgheap.c

@ _dllonexit_nolock(int (void)* func, void (void)*** pbegin, void (void)*** pend) in onexit.c

@ __dllonexit(int (void)* func, void (void)*** pbegin, void (void)*** pend) in onexit.c

@ _onexit(int (void)* func) in atonexit.c

@ atexit(void (void)* func) in atonexit

@ 'dynamic initializer for 'myClass''() in myClass.cpp

@ _initterm(void** pfbegin, void pfend) in pureMSILcode.cpp

@ <CrtImplementationDetails>::LanguageSupport::InitializeNative() in mstartup.cpp

@ (eventually) languageSupport.Initialize() in mstartup.cpp

Any ideas on what is going on or where I should be looking? The usual suggestion is look for heap access failure, but the words 'new' or 'malloc' do not appear anywhere in my code.