When i log in as main user, the display seems to crash. It only shows artifacts and the unity bar at the top. When i log out and back in as a guest everything is fine. So there must be a config in users directory which is loaded at login and has wrong settings so the display fails.
I tried recovery mode and deleted /etc/X11/xorg.conf but that does not help. Ifound some files in user folder but i don't know which one to edit or remove.
I use Ubuntu 14.04 with 3.15 kernel which was working fine so far. The problem started, when one of the monitors got disconnected from graphicscard and the system tried to jump into single monitor mode. Since then i can't use the system with main user. Only guest works. Maybe someone can help
Thank you so far!
Edit: In safe mode it also works very well.