Custompress conflict with another plugin


I detected a conflict between Custompress (for classifieds plugin purpose) and Social deals engine.

The admin menu of Social Deals Engine does not appear unless, custompress is deactivated.

I tried activating deactivating on network or blog, it remains the same.

I guess it is a matter of content type since it is quite clear that Social Deals Engine uses CT.

How could I try to make them coexist peacefully ?
- Inserting a kind of exception code ?
- Integrating Social deals engine taxonomy in Custompress ?????

Thanks for your help !