Anyway I unchecked 'configure as tempo-based effect' for FabFilter Pro-Q 2 last night, and I loaded a problematic project this morning and found that all of my Pro-Q's were intact with their settings left alone. So there's one clue that playhead position data could be causing problems in plugins. This idea was partly fueled by someone else who was experiencing the same problem as I used to with the Quadcurve EQ, and he said that he actually saw it happen in real time when he was clicking to position the playhead in various places on the timeline. I'm guessing that when they are configured so, Sonar will be passing data to them about the tempo and the song position, and perhaps somehow this data has been sent incorrectly or is ending up in places it shouldn't. So I've tried various things without success but yesterday when I was racking my brain trying to think of ways in which Sonar could be telling these plugins to reset themselves (if that's what's happening as opposed to Sonar simply not saving the settings properly with the project file), it occurred to me on a whim that perhaps the problem is that these plugins are configured as tempo-based effects by default.

Because of this, it's really hard to pin down a cause (although I'm sure the Bakers could have figured out ways in which it could happen if they'd really pulled out all the stops). Now it didn't do this ALL the time - sometimes a project would load with all settings intact, but most of the time either all of the plugins or a select few of them would load without their settings. I recently discovered that it does the same thing to FabFilter Pro-Q 2 as well - sometimes completely resetting the plugin, other times doing something like resetting my high and low pass filters while leaving the bells untouched. Recently it's been Waves Q10 EQ and Waves SSL Channel, although I've heard other people mention different plugins. I've been pretty vocal about my problems with Sonar obliterating plugin settings, having lost countless hours of work because of it. Possible fix for plugin settings not being saved?

Waves ssl plugin not showing up sonar