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Poor video from CPT monitors

  The video quality of several CPT monitors
seems to be a strong function of how long they
have been powered on! The monitor currently
on CADR-4, for example, looks perfectly ok
for a quite a long while after powerup, but
eventually becomes barely usable.
  This probably also explains why a number of
monitors flushed for "poor focus" work perfectly
OK when tried later.
  We should determine what causes this.  (Probably
something getting hot).
  Until we can work out a better solution, I ask
users to turn off certain CPTs when they are not in
use.  Currently, I think CADRs 1,4,9, and 10 will
benefit.  Hopefully, we can soon come up with
a real fix.