I modified the theme 'TwentyTen' to make my own theme. After a few days, when everything was up & running, i found out that my own theme was replaced with the original TwentyTen pages. Now when i try to edit the pages (Appearance - Editor) and press the 'Update file' wordpress logs me out. I tried a reinstall and deleted all the plug-ins. Didn't do the trick. Anyone had this before? What's the catch? This story doesn't count for one website but for several.
[DO NOT bump this topic again - please be patient]