https://bugs.winehq.org/show_bug.cgi?id=45478
--- Comment #5 from Bjoern Bidar theodorstormgrade@googlemail.com ---
This may not be a bug with wine, since I was able to correct it in game, by >going to the system menu, advanced, and selecting my graphics card. Changed >from system default to GTX 970 and it rendered properly on all my characters, >from that point forward.
You probably just restarted the graphics engine while doing this. Wait so time (can take a bit) and the error comes again.