[Chimera-users] Chimera-1.5.3 on RHEL 5 Linux workstation does not display surface

Folks, I recently upgraded my LINUX to RHEL 5 (its an old machine and RHEL 6 did not recognize my old graphics card so I settled for RHEL5). I have installed xterm (eg yum install xerm). I downloaded Chimera 1.5.3 build 33475 2011-5-24 17:23 When I read in a PDB file and then try to display a surface, the calculation finishes but the display of the surface is fragmented with only a few of the triangular surface components displayed. The issue is not confined to a particular PDB. A windows version 1.5.3 works nominally with respect to surface display. So I am wondering if I have my xterm properly installed. Can you suggest some things for me to examine? Thanks Starr