Hey d_stranz,

No, it is not possible to mix debug and release binaries on Windows using Visual Studio. The name mangling, layout of the virtual dispatch table and other things are different between release and debug builds, so it simply will not work. This is not related at all to Qt - it is true for any VC++ project.
Good to know.
I will release the debug dll's im my dev-kit to avoid my problem.

I'm wondering that some software i use do not need to ship the debug dlls - it is created with visual studio and i check the dependencies with dependency walker - and my plugins are debugable

Thx for your answer.

Greetings
Tonka