Debug Assertion Failure

Hello,
I've encountered a strange problem I don't know how to approach.

I've written a program with a MFC interface. Through that interface,
the user can call a function, which has nothing to do with MFC - it's
a function that reads data from a file, and works correctly when I try
to use it in a test, non-mfc program.

When the debugger hits the "return true" line of that function, a
debug assertion failure window pops:
File: dbgheap.c
Line: 1011
Expression: _CrtIsValidHeapPointer(pUserData)

I have no idea what that means, nor why does an MFC error occur in a
"regular" function that doesn't deal with MFC.

Any help would be greatly appreciated,
GK

.

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