VR Portal in build has incorrect projection (sometimes)

Hi,

I'm having a problem with my VR portal when playing in build but only some of the time!

I have a camera that renders a texture and applies this to a quad to produce the portal (when moving). This generally works but every so often it doesn't produce the correct projection and I get a weird squashed effect.

This is the exact same code running in build:

Projection incorrect:


Projection correct:


I kinda modified...

VR Portal in build has incorrect projection (sometimes)