Had this with 5.00b7, still have it with b10.
Worked with b7 for weeks just fine. Then today, battery ran down. After recharge, when you give the blue button rotate to a compass heading commands, Karl (Rovio) just spins until new command given. Can still hit paths, go home, and all other commands work fine. Many reboots, and as noted, a firmware update. Repeatable with safari and firefox. Ideas?