After a day I went back to rc1:

1. Layout problem: The heading "Ordner" /"Folders" is not on top of the folder list, but floating over "Deleted".
2. Deleting mails by drag & drop removes them from the current list of mails but does not move them to "Deleted".
Latest after relogin they reappear at their original place.
3. Not sure any more about this: Opening a email and deleting it from the drop down menu did not work as in rc1.

Stefan

When you say "delete", do you mean move to trash?

1. I had that problem too and found the fix in the css file (main.css, I think). Look for something like messagelist. Better yet, copy it from RC1, which is set correctly.
2. I can drag and drop without a problem. I drag from any folder to trash and they stay in trash until I empty it, and that works too.
3. The drop down doesn't work for me either.