sorry my message was duplicated several times when i tried to paste
"OutlookRibbonXCS_VSTO" from anoter place.
The end of my message is:

I also tried to download a OutlookRibbonXCS_VSTO example from microsoft, and
replaced COntact inspector with mail inspector - got the same strange
behavior as in empty project. So i think it's a bug.
Any ideas how to struggle that?
Thank you!