Compiler stuck in Infinite Loop with VRTK and Realtime CSG Imported

Hi.

I have a strange Problem. Dont know where it comes from but I have it on 3 diffrent PCs with two diffrent Unity Versions (2017.1.0f1 and 5.6.2f1)

If I have the Assets VRTK and RealtimeCSG in the same Project the Compiler gets stuck.
Ahh maybe not stuck because it seems to finish compiling just to start again immediately.

Nothing I tried worked. Reimporting does nothing to change the Problem. The only thing that helps is removing either VRTK or RealtimeCSG from the Project. But I need both.

Does someone have some Ideas what I could do. A Workaround or something?

No one? Well. UE4 it is then.