ATC sound problem

Can't decide if this belongs in hardware ornot but having a problem with ATC.Just got a new mobo and sound card - Asus Rampage Formula. Set it up so that sounds are thru speakers and ATC Voice is thru headphones.Start a flight with default Baron (plane doesn't matter) - hit ATC and contact ground, get clearance to taxi. So far so good, I can hear them and they me. Taxi to rwy, click contact tower, get option to request t/o - click - NOTHING. If I hit the number, the selection bloinks. If I click the number, the selection blinks but no dialogie shows nor do I hear anything.I tried the old 'fix' of switching from com1 to 2 and back - nothing.If I exit and come back in - same thing happens.I've tried no acceleration and fulol acceleration with same results.Anyone run into this before?ThanxQ9650 E0 CPU 3.0 o/c 4.06Asus Rampage Formula X48 2G XP2-8500 DDR2 1066FSB Mushkin 996535 RAM 5-5-5-12-2T1-74G Raptor - XP System1-74G Raptor - Data1-320G 7200 - Programs 1-150G Raptor - FSX 1-500G 7200 HD for backup SATA DVD burner Evga 8800GTS 640 PCIx XG 174.74 702/1620/792Kandalf LCS case w/ built in liquid cooling 850W Thermaltake power supplyHannsG 28" 1920x1200Viewsonic 22" 1680x1050http://www.hifisim.com/banners/hifi-supporter-sigbanner.jpg