I've installed arch linux x64 on my computer. I added other user. Also I added this new user to common groups. When I type startxfce4 by root, xfce4 runs properly and it's possible to use it. But when I type startxfce4 by newly added user xfce4 also runs. But instead default mouse in background I can see black screen, can't see cursor. Panels are visible. After call "turn off" dialog (I can't see cursor, but panels are working and I can see if cursor is on a button of the panel) cursor appearances. If the cursor hovers panels it's ok. But if this cursor is over background I can see big cross cursor like in checking of working xorg-server. When I run su before executing startxfce4 xfce4 also doesn't work correctly. What did I forget during install xorg-server, xfce4 or during adding new user?
Answer is here. In a nutshell the problem was xfwm4 wasn't running, I forgot do that. I typed xfconf-query -c xfce4-session -p /sessions/Failsafe/Client0_Command -t string -sa xfwm4 and it worked.