Kmail stays at 90% while reading folder

Hi, on an IMAP account at gmx, Kmail tries to read the Trash folder. The progress bar goes to 90% and stays tere for a long, long time (i.e. it never goes on). I can see these processes with "ps -ef| grep kontact":

rainer 25896 6419 0 12:21 ? 00:00:00 kdeinit: kio_newimap4 newimaps /tmp/ksocket-rainer/klauncherCLmSjb.slave-socket /tmp/ksocket-rainer/kontactvKZE2b.slave-socket rainer 25897 6419 0 12:21 ? 00:00:00 kdeinit: kio_newimap4 newimaps /tmp/ksocket-rainer/klauncherCLmSjb.slave-socket /tmp/ksocket-rainer/kontactuDSiAa.slave-socket

I can read this folder with Mozilla without any problems. My configuration: SuSE 9.2 with all updates. KMail 1.7.1 from kdepim3-3.3.0-32.2 Any hints? kind regards, Rainer