The upload handler is now reactivated.

Everything should work for the moment.
We used a different partitioning scheme for our new server, and it seems like we miscalculated the space requirement for the new root partition.
We are still investigating why the free disk space has diminished so fast during the past few days.

Sorry for the inconvenience.
[Thomas]
http://boinc.fzk.de/poem/forum_thread.php?id=969#8562