mine's used with a harmony ultimate. flirc 1.3.6 with firmare 3.6. i am not sure if the problem was in before, but lately, i've had scripts that did automatic configuration changes to the flirc. it didn't seem to like that too much, and at some point the driver/firmware got corrupted. i reinstalled the driver and firmware and mostly things seem to work now. one thing that still seem screwed up is the modifier keys. ctrl, alt, and shift mostly seem to be getting stuck and keep being sent although i can see on the harmony hub that nothing is being sent IR-wise. so if i have a combination of shift-alt-F7, then mostly, after i use it, the shift-alt are still being pressed, and if i hit F9, it'll actually do shift-alt-F9. this is pretty bad, as if i have only alt as a modifier, then things really go crazy since alt does shortcuts with many things. i had to remove all modifiers from everything in order to get things not to go haywire.