I reinstalled WordPress, cleared my cache, signed in as a different user, recleared my cache, then signed in as myself again and it worked. Good luck dococh, hope you get it figured out.
This same thing is happening to me and started when I upgraded my site. Everything is white when I type and I can only see it if I highlight it with my cursor. I also tried all the things listed above by the original poster.
I logged in as one of my contributors and they can see everything that I cannot.
I can’t get into the dashboard at all. Would I change the FTP through my hosting service?