xterm will not open a windows

Hi, we have a linux cluster (dual opteron) running sles9 AMD64 SP3. I can not use xterm. There is no error messages. Nothing happens. xlogo or other stuff is working. Any idea ? -- Bye, Peer _________________________________________________________ Max-Planck-Institut fuer Biogeochemie Dr. Peer-Joachim Koch Hans-Knöll Str.10 Telefon: ++49 3641 57-6705 D-07745 Jena Telefax: ++49 3641 57-7705