When open gl option is active using liquify transformation makes the whole picture canvas dissapear. You only see white. You need to close the image and open it again to make it work again. I use radeon with propriety drivers. Reproducible: Always
Yes, well, Radeon + proprietary drivers is the problem... It's a bug in those drivers. We don't have the hardware here, so finding a work-around is pretty hard :-(
With open source drivers, it works but display become transparent (I see checkers) time to times : zooming, panning or changing something in tools options bring display back.
This bug doesn't exist anymore.
Thanks for checking!