Automation not recording in Pro Tools

I have a user reporting that automation isn't recording in Pro Tools, however it records fine for me on my desktop and laptop (PT 11.3 & PT 11.2 on Yosemite) 

I'm calling beginChangeGesture/endChangeGesture/setValueNotifyingHost from my UI thread. 

Anybody run into any other issues that would cause automation to not record? Anything obvious I'm missing?

Nevermind: Automation preview mode.