Unfortunately I haven’t been able to reproduce your issue - however, the error message that you’ve received from FMOD Studio stating that the “Process crashed” indicates that instance of Reaper that FMOD Studio creates to sync with your Reaper project has crashed. If you attempt to render the regions of your Reaper project yourself (i.e. via File → Render, without syncing it with FMOD), does Reaper crash? If so, do you receive any error messages? Additionally, when you receive the error message in FMOD Studio, what does the FMOD Studio Console’s “Logging” window say with “Verbose Logging” enabled?