It seems that Cubase crashes when you load a model in 0.7.6.

With your patched version of iPlug2 I think it doesn't crash predictably each time but with the iPlug2/master where I have done further work on the RealtimeResampler [FKA NonIntegerResampler] class it crashes predictably each time (at least on my mac).

I believe I have tracked it down to a bug with where GetBlockSize() initially returns zero for VST3 in iPlug2. I've fixed that here. Since I wasn't able to reliably reproduce the crash with your branch, this is still a theory, but you could try cherry picking that commit to your iPlug2 fork (if you are not yet comfortable to merge #406) and see if it helps the users who are seeing crashes.

hope that helps!