Go to Tools => Effects and Filters => Video Effects => Geometry and check the Rotate box. When you turn the compass around, you'll see the image cant about 5 degrees and that's it. No (more) rotation. Actually it looks like the compass angle allows the image to be set to 0 to 5 degrees rotation. Just a guess but perhaps this is a degrees vs. radians problem (off by a factor of 180/pi).
The transform checkbox works to rotate the image by 90 degree increments.
Windows 7 SP1 x64