OK, the problem didn't go away.
What happens is this:
When I first log in to X, starting xhexagons and clicking on it blanks the
screen. If I start Netscape (R)(TM)(C) first (apologies to RMS)
(my homepage is www.debian.org) and then start xhexagons while Netscape is
running, xhexagons complains:
Warning: Cannot allocate colormap entry for "Gray"
clicking on it doesn't blank the screen. This is effective
until I log out of X. I can close Netscape, close and restart xhexagons,
and the problem doesn't recur. I just tried Option "xaa_no_color_exp"
and that didn't help. Any ideas?
TIA,
John Dalbec