Problem with delating main widget components (backtrace included)

[marcel]

Most often you can create the main window object on the stack in your main() method so that it is destroyed automatically when it goes out of scope (when main() returns). This way you don't have to care about deleting it.

But this is what he did. Just look at the trace.
Delete would have been in the trace if he had called "delete libwin;".

Anyway, most likely jpn is right - that QComboBox has been deleted somewhere else.

Regards