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It appears from the 2.70 source that the item data set into a combo box is going to be a memory handle. There is no requirement for this to be the case with the base MFC or Windows combo box classes. This creates a problem for us because we use simple indexes on alpha sorted lists as the item data. When the index is zero we get assertions in CExtComboBoxBase::OnCBGetItemData. The work-around for us is to increment and decrement the index before and after it comes out of the combo box but that does complicate the code a bit and requires an extra comment line at every single access to make sure that engineers maintaining the code in the future don’t mess it up.

Was there a particular reason for this?

Thanks
Jon

Would you reproduce the problem in a simple test project and send it to us so we can quickly find out what is wrong?