Super+F and Super+A used as custom shortcuts stop working when using laucher shortcut

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http://askubuntu.com – Before upgrading from 10.10 to 11.10 I used a lot of shortcuts of the type Super+letter like Super+T for terminal and Super+F for Chrome. I also used Gnome Do with the shortcut Super+space for some other applications that I didn't have a shortcut for. Now, in 11.10, I modified the shortcut for the launcher from just Super to Super+space since it allows me to use Super for my old shortcuts and the dash menu replaces Gnome Do. It works almost perfectly except that there is a weird behaviour with Super+F and Super+A (I'll only mention Super+F from now on for simplicity). When I login, Super+F wo (HowTos)