A brief sketch of typical usage and failure mode: I am running CTWM with eight workspaces (most are populated) and switching among them fairly often. The most active X apps are xterm, Firefox, exmh and mahjongg. I typically have several Firefox windows open, each of which has multiple tabs active, sometimes dozens. Failure seemed most often to happen immediately after I switched workspaces or raised a window, though I've not seen it even once since this I made this fix.
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