I've encountered a bug in recent Cat builds (using 329) where the full-screen GUI does not respond to mouse clicks. The keyboard is fine, and mouse clicks elsewhere are good. This means that mixes, presets, FXs, etc. are uneditable. I have ensued that all mixes are turned off, and just the GUI on.

I am unable to work out what's causing it - restarting the Cat software sometimes fixes it, but more often not. Restarting the machine usually fixes it.