Thanks Greg, got there in the end.

Uninstalled/reinstalled. Had to rescan for VST folders/plugins, and reinstall legacy plugins - but not too painful

Any other thoughts on this?

Sorry for late reply - just saved an effect chain, and yes - visible in MetaPresets7 folder. The install log also did mention 0 effect chains found, so it was aware when I reinstalled. 09:22:34 [235 mils] : Scanning Effect Chains. 09:22:34 [235 mils] : 0 Effect Chains found. Seems the log location's...

Thanks Greg, I thought I'd installed all updates (there were a few over the past few times I started Mixcraft). C:\programdata\Acoustica\Mixcraft\MetaPresets7 was empty (other folders seemed ok). I downloaded the latest installer (10.5.596), and installed. This then had one more update (Controller S...

Not 100% sure whether my issue relates to the 10.5 update, but for some reason I now don't have any effect chains available in Pro Studio. It's like they got wiped out somehow. I opened a previous project where I'd used a mastering effect chain, and all the effects were there, but again - '<No effec...