Problems with VST3 mouse events in Ableton on OSX

Hi this is my first post here! I'm really digging JUCE so far :D

I'm making a synthesizer plugin and have been creating some custom UI elements but I've noticed that I don't get mouse events in the VST version in Ableton Live on OSX if the mouse button is not being held down. In other words I don't get events like "mouseMove" "mouseEnter" "mouseExit". It is quite possible I'm doing something wrong but it works fine in the Audio Unit everywhere I've tested and it also works well as a VST3 plugin in the VST3PluginTestHost and Reaper which is all I've tested so far.

Has anyone seen this kind of behavior or can offer any help?

I'm running OSX 10.10 (Yosemite), building in Xcode 6.1.1 and using JUCE 3.1.1

Also, the synth is gpl open source if anyone is interested: