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[Brian H]

An UPS many times is a great X10 signal killer if plugged into the wall directly.

The UPS should be the one with an X10 filter on its AC power input.
I have a 10 amp FilterLinc on mine.

Almost 100% chance the UPS has a AC Input filter in it and the monitor is already filtered.

That AC filter on the UPS power input is what kills the X10 signals as it is noise to the UPS.

[Jason B]

Thanks again. Don't you find it strange that just unplugging the monitor plug only... Fixes the situation? There are a ton of other things plugged into that UPS, but only the monitor messes things up when plugged into it. BUt if I plug the monitor into another outlet, the problem doesn't exist either.

[Brian H]

Strange thing can happen with electronics. Murphy like to mess with me all the time.
It can't hurt to try an X10 filter on the monitors power cord directly.

[JeffVolp]

From your descriptions, it sounds like your system is marginally working.  In that case small changes in the electrical environment can impact system operation.

The problem is probably a combination of weak signal levels and electrical noise on the powerline.  Isolating "problem" devices with filters will help.  So will boosting your signal levels.

You may find these troubleshooting guides helpful:

     http://jvde.us/x10/x10_filters.htm

     http://jvde.us/x10/x10_cellet_noise.htm

Jeff