On Jun 5, 2008, at 10:23, Johnny Hughes wrote: > I would initially start out but looking at any 3rd party installed > products. One of our third party applications (SlickEdit) has been having its share of issues. We finally had an error message (Xlib: resource ID allocation space exhausted) that produced an interesting Google hit: http://fixunix.com/xwindows/351264-core-xlib-xid-allocator.html Here is some of the relevant information from that page: The problem is that right now if you don't use the Display internals, and override the XID allocator associated with each Display structure, the code eventually hits this in libX11 (_XAllocID()): if (id != 0x10000000) { (void) fprintf(stderr, "Xlib: resource ID allocation space exhausted!\n"); id = 0x10000000; dpy->resource_id = id >> dpy->resource_shift; } So, if you have an application running for weeks or months that allocates XIDs over a period of time, for GCs, Pixmaps, etc. you will eventually hit that, unless you carefully replace the core allocator for each Display, and reuse ids. I can't vouch for the accuracy of that information, but it does seem plausible and applicable to my situation. And it appears that this issue did not exist in CentOS 4, or at least I did not see it until I upgraded to CentOS 5.1. Alfred