Installed Workbench 11.0 SP1 on CentOS 4.7, and everything (i.e., DesignModeler, Simulation) worked fine.

(I chose CentOS 4.7 since it’s similar to Red Hat Enterprise Linux 4, the latter of which is official supported for Workbench 11.0 SP 1.)

I also tried CentOS 5.2, but I had some problems running Workbench 11.0 SP1.