Thanks a lot for your hints. At the moment I have the impression that
it might be a conflict between the customization based file and other
Excel files without this customization but also containing macros.
Once one of these other files had been loaded the one in question
doesn't load the customization whereas it does load it when no other
Excel file was open before.

Ahhh...! Therein lies the problem. So your EXE isn't using its own
instance of Excel for its intended task, but rather 'hijacking' the
user's instance instead. Bad design IMO!!!

--
Garry

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