I have a c++ app that uses a managed dll through <gcroot>

In german OS only, this app is crashing only if a dialog in the managed dll was shown, I cant reproduce this on my dev machine. It only happens after closing the application and ExitInstance is finishes executing.

I'm assuming that some pointer is trying to get released while its delted or the other way around.

Any thoughts as to how to debug this? ASAP I'm really stuck and thank you a million.