Hi Andreas-

Sorry to hear that you're having problems with UltraReverb in Ableton. 

-Are you using the AU or VST version of UltraReverb?

-What directory is the plug-in located in?

-Can you send us/post here the crash report so we can see what is happening?

We can get you an older version of UltraReverb in the meantime. Send an email to support@eventide.com mentioning your issue and my name, and I can send you an older version.

Best,

Tom