Unity 5.3.1 is out !

I too am experiencing the Canvas flickering in GearVR builds. Flickering occurs in the right eye only when the canvas updates, in my case I am enabling / disabling an image component on mouseover, using gaze tracking as well. The canvas contains a scrollrect, and a large number of image and text components that overlap. Haven't tried with 5.3.1p2 yet, I'll see if updating fixes it, and if I can reproduce it in a simple project.

Great to hear that someone else is having problems, too ;p. I spent a fair amount of time trying and failing to reproduce it in a minimal project. If you manage it, please pass it on to Will at Unity.

The problem is still present in 5.3.1p3 (as is the LineRenderer problem). Did you have any luck reproducing it in a simple project?