For future reference......Check the firmware version of the T3, makes sure it is 1.6, Put codes that behave strange on a blank page with no graphics, or back ground of any kind. If the commands work under this test, then you are having a "stuck layer" situation which we saw a lot of in the first run T3's and K4's. The odd thing is this “stuck layer” problem would only happen with some but not all codes. The firmware upgrade corrected this problem.

Further there were a few RM-433's that were just plain bad. The test led would start to turn red over time and the unit would eventually become completely non-functional no matter what you did with it.