Hi, thanks for testing that. It seems to be a MIDI based issue rather than a CPU problem. Unfortunately, as mentioned it’s not something we’ve been able to recreate on our end. Could you let me know the specific version of FL you are running?
I’m unsure if this will resolve the issue but could you setup an IAC driver and use that as a the MIDI input in FL as opposed to our virtual MIDI port? It may be interesting to see if this makes any difference. You can see our guide explaining IAC drivers and how to set them up here - https://vochlea.com/tutorials/setting-up-an-iac-driver-on-mac-2
Thanks again for your patience on this, if we need we’ll reach out to image-line as the crash reports will be more useful to them than us in regards to what’s causing this