Move mouse in a circle while holding mouse button fails in multiple browsers.

This test fails in both Windowed and Fullscreen.

Repro Steps:

1. Launch 3.5.6 Unity with attached project
2. Editor menu called "tests" -> Click on "run manual tests in WebPlayer"
3. Run WebPlayer build in IE9
4. Progress through to test "Move mouse in a circle while holding mouse button"
5. Observe this fails

Desired outcome: Input to be recognised

Note: I've seen this fail and pass.

Output log file attached named "IE9 input test log.txt (6 KB)"

Fails in other browsers:

Opera 12
Firefox 14.0.1
Safari 5.1.7 10.7 OS X- failed in windowed mode - passed in Fullscreen
Firefox XP OS
FF 10.7 OS X
Safari 5.0.6 10.5 OS X
Safari 6 and ML OS X

Editor / WebPlayer versions: 4.0, 4.0.1f1 / f2, 4.1f1.