I Can't interact with files and applications after first login

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http://askubuntu.com – Every time I restart my computer and login into my ubuntu account for the first time, I can't click on anything besides the bar on the left. I can start Firefox from there, but I am not able to click on the new tab button etc. Same will all other apps. I can start the Terminal via the keyboard, but I can't move it around. I have to logout via the keyboard and login again. Usually everything works fine now. Just waiting doesn't help. The only obvious change I made to Ubuntu was to move the /home directory. (HowTos)