Just checked cache was not able to fix problem... still able to play in "fullscren window"

somehow problem was solved. (unknown)

Upgraded to windows 8 Seems to have made the bug come back...

Deleted Appdata info and aram 3 profiles. still have issue.

Please let us know if you are still able to reproduce this issue in latest Development build. Thank you.

Yes this still seems to be occuring. Note i am using dual screens.

Tried change configuration of my monitors that did nothing. It seems that even with full screen the mouse is not capturing the window( can still move mouse between monitors) its almost as if the full screen is above the mouse in a way.

OK So i may have found the porblem but not 100% sure of the fix as it just started working again.
When i was going to my display setting/ resolution settings it was showing screen # 2 on the left and screen 1 on the right. although i still could move from screen 2 to screen 1 by moving my mouse right it was just bugging me fixed that problem and when i started the game today i could seem my mouse when i changed options.
Here is a picture of what i mean
http://i.imgur.com/xt9lHVy.png

@Astaroth, it's not valid anymore. Ticket can be closed.
As it was user's fault with configuration of monitors in Windows.