There are currently some compatibility issues with Slate Digital plugins.
Current status is that the AU versions crash on OSX.
I advise any users that have issues with Slate plugins to contact slate support. This is because it is impossible to fix these issues without help from Slate (since the crashes come from inside their code) and Slate Digital does not want to cooperate on the issues.
Here is Slate’s response:
Unfortunately at this time, our developers have no interest in supporting LiveProfessor. We have not had significant enough demands or requests to support this DAW.
So in short, as many as you need to complain to Slate.