Ableton Mac VST (mouse issues - fixed in 9.1.3)

I've had a support ticket open with ableton for weird mouse behaviour affecting Mac VST plugin instances only. 

Torsten at Ableton reports they could reproduce the problem with 9.1.2 but not after some changes to mouse handling in 9.1.3.  They replied last week and I've just tested it. 

So if you were missing some mouse events with your Mac VST ... it should be okay now :)