It looks like there is a bug in
Microsoft.Office.Interop.Excel.AppEvents_Event class implementation - it does
not close events sink properly.

So, solution is to implement disposable event sink class based on AppEvents
interface by yourself and connect to Excel events sink using
IConnectionPoint.Advise method.

In Dispose method you would need to disconnect using
IConnectionPoint.Unadvise() method.

"Sergei Didur" wrote:

It does not apply to my case.

I am having problem with any VBA AddIn including the ones created by
Microsoft (unless they are not following their own recomendations).

The problem only occurs when .Net add-in and VBA add-in subscribe to the
same Excel event and VBA add-in shows any form.

It looks like a bug to me.

"john" wrote:

Microsoft help & support site have an article on this subject which may help.
http://support.microsoft.com/kb/280454
--
JB