This is the base situation:

I have a couple of document templates that all depend on the same Add-In.
Every template shows the same toolbar that I have manually created. Some of
the controls manually added to this toolbar are of type msoControlPopup, some
of type msoControlButton.

In the Add-In, I am customizing the manually created toolbar by means of VBA:
At the "new" and the "open" event of the documents, I am first removing all
controls belonging to the main popup controls and then adding them again to
the popup controls. Again, some of these sub-controls are of type
msoControlPopup.

This is the problem:

When I am creating a new document or opening an existing one, everything is
fine.

When I am creating or opening a second or a third or a ... document, the
popup controls are disabled (and only the popup controls). Sometimes, only
the sub-controls are disabled, sometimes, the main controls are disabled.
Unfortunately, this does not happen regularly. I have observed though that
the phenomenon ALWAYS occurs when the concerned document does NOT have the
same template as the previous one. But it sometimes also occurs when the
concerned document DOES have the same template as the previous.

By setting the breakpoint before the code removes the sub-controls, I can
see that the main controls already are disabled before the code even touched
them.

When I call a MsgBox at the end of the toolbar filling that tells me the
enabled state of a certain control, it tells me "True" even if the control is
disabled.

What I have tried already (but it did not help), always by means of VBA:

1) Explicitly enabled all popup controls after they are all created.
2) Created two templates with the code of above point 1 (that code normally
comes from the Add-In).
3) Checked and re-checked the CustomizationContext (ActiveDocument)

What am I missing here?

Help would be appreciated!

Thanks, Sheila