Hi Dietz,
I'm not sure about this, but I guess that MIR Pro causes immediate crashing of Logic Pro X at startup. Strangely enough, lately MIR opens itself without any reason when starting up Logic, even without opening a project. That didn't happen before. I suppose it has to do with the latest Logic update (v. 10.2.3). As far as I can remember, that didn't happen with the previous version of Logic. Then MIR only started up when asked (within a project).
Now, it starts together with Logic and the lot crashes immediately after.
I work on a iMac (El Capitan), 32 Gb RAM, 1,1 Tb disc space, intel Core i7, 3,4 GHz).
Have you heard similar reactions?
Kindly,
Max