Can't edit master effects!

Hi there, I've loaded up some vst's in my track fx - pressing the edit button opens up the effects rack and i can edit settings like normal..
However when using effects on the master output - the edit button lights up, but no rack appears. The main mixvibes window loses focus too, so it looks as though an invisible window is appearing or something. Please help, this is quite crippling!
Edit: Just thought i'd say i'm using the latest version of mixvibes Producer!
However when using effects on the master output - the edit button lights up, but no rack appears. The main mixvibes window loses focus too, so it looks as though an invisible window is appearing or something. Please help, this is quite crippling!
Edit: Just thought i'd say i'm using the latest version of mixvibes Producer!