Same problem, load up SWTOR with no problems, then alt tab out and get input not supported error. Then have to manually switch the pc off, load in safe mode and reboot.
If you're on ATI, tried this yet?
''After going into my Catalyst Control Center, under ''My VGA Displays'' and then Properties, i manually overrided my monitor attributes and set my maximum refresh rate at 60hz. So far i've been able to alt tab out of the game. Hope this helps if anyone else runs into the same issue, will update if the problem occurs again.''