Crash when using "transform to instrument"

recently I've started working on my first project using OS, and since I'm using several sample based instruments, I've used the "Transform to audio track" feature, with the goal of a faster project load.

However now I want to rework on some of these tracks, but when I try to reconvert to instrument, using the Transform to Instrument feature, SO always crashes - no error message, nothing, it just dies and disappears.

Two tracks are Presence instruments, one is EZKeys, another one a NI Kontact sampled instrument, and all of them cause the crash - so it looks like a problem not restricted to a specific instrument or plugin. If that matters, all plugins are installed and they work

Any idea why that happens?

Thanks

- Antonio

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System:

- macOS Sierra 10.12.6

- MacBook Pro late 2013, 16GB RAM

- Studio One 3.5.1.43560