Why don't my desktop icons stay in place?

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http://askubuntu.com – I'm running Ubuntu 11.10 and a few days ago I switched to gnome3. Now I have still a few folders I'm using for everyday work on my desktop. I want to group them in specific areas of the desktop to reflect my working style ... but every time I log out and in again, all folders, icons etc. are grouped at the left border of the screen. Is there some way to stop this (meaning: keep the icons in the places where I put them)? I tried the "keep aligned" switch in the desktop right-klick menu, but this didn't change anything. It only helped to align icons on a virtual grid. Then I did web searches in (HowTos)