I found an odd bug in Ural’s Delve, the cave in Timberline Falls, I reached the skill point when, exploring the spot, my computer restarted. I relaunched the game with the same character and when I tried to move the camera, system restarted again.
Windows alert said that the problem was caused by a blue screen (that I never seen, because my screen turned off in this two cases), so I tried with my other 4 characters, played few seconds and have no problems.
I relogged my main and teleported it away from this grotto so I started playing again, without trouble.