I have a project that uses a lot of ressources. Option for suspending processing on VST3 when no signal is received is active. Asio guard as well.
If I play the project, the meter is high, but it does not crack.
If I select a (instrument) track that has lots of plugins (mostly VST3), and hit play, it cracks. If I select an empty track, or another track it works. Maybe the selection of a track disables asio guard on this track, or something ?
I noticed the same problem a long time ago when opening the midi events in key editor. If the many tracks were selected, it consumes more ressources!