[CM] snd crash

[Bill Schottstaedt]

Thanks for the bug report!  I can hit the same problem in the gtk
version of Snd, but not the Motif version (in OSX 10.5 of course).
Using --sync and breaking at gdk_x_error indicates that the
problem happens in gdk_draw_rectangle (from the args I think
it is trying to clear the graph, or perhaps draw the background
color), and the actual offending line calls XFillRectangle.  Everything
in the stack looks fine to me -- this happens in both gtk 2.10
and the current version.  I will google around -- maybe someone
else has hit this bug.