If I try to login on a Debian with XFCE it gets a blackscreen for a few seconds, then it flashes really short and puts me back at the login screen.
The strange thing is, if I go into a terminal using Ctrl + Alt + F1 (Or any other F key) I can login, and get into the GUI using startx. Everything works like usual.
I installed Debian the same way on 4 different machines but none of them had this error.
I used debian-8.2.0-i386-xfce.iso for installation with a USB stick.
Somebody has a idea what could cause this behavior?
I had the same problem using Jessie 8.6 with the kernel 4.7 with cinnamon, and I did almost the same: I just changed the ownership of the /home/user/.Xauthority file and it also worked:
chown user.user ./.Xauthority