Opening context menu causes focus to be stuck in a "True" state.

Launch a WebPlayer build, ensure you have a WebPlayer installer which includes the ability to switch channels (4.0.0rc4), right click to open context menu, do not select anything, click off the context menu to close, after this action the user cannot click away to lose focus on the content. Workaround is to alt tab away to another application.

Repro Steps:

1. Launch Unity 4.0rc4 and build and run a WebPlayer from attached project
2. Launch the WebPlayer build into IE10 on Win 8
3. Right click to open context menu -> move cursor away from the context menu
4. Left click inside the content window to close context menu
5. Try to close the tab or the browser window
6. Observe this is not possible

Desired outcome: Ensure focus can always be switched by clicking off and on content.

Video attached, drag and drop into browser to view, file named: (Focus_bug_with_context_menu.swf).

Project folder and WebPlayer build folder attached.

Windows 7:

IE9: Not reproducible
FF: Not reproducible
Chrome: Not reproducible
Opera: Not reproducible
360: Not reproducible

Windows 8:

IE10: Reproducible
FF: Not reproducible
Chrome: Not reproducible
Opera: Not reproducible

New to Windows 8 and IE10 combo.