>Naomi --
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>Well, if that's the case, then I should be able to correct for it. Can't see why that could possible cause a data overrun problem, however, and certainly not when adding a new method; it would only make a difference if you where looking at parent code or parentage, and then it should just invoke MessageBox.
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>Am most curious to learn what you find out.
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>
I'll tell you more tomorrow, but this is what I did when it happened.

I opened proDataHandler class library. In that class there are no custom code, I believe. I opened the parent's DataChanged method (may be I did this few times), then copy its code to this class, made two changes and then tried to add a new method from the Class/New Method menu. This is when the error happened (and of course my changes were not saved).