Some more bug fixes

• Fixed resource leak causing game to hang when playing a long time
• Fixed potential crash when script code returns an error
• Fixed OK button in loading error screen
• Fixed wrong and/or badly selected display size in fallback screen size selection code
• Removed a SetCurosPos call in hope it fixes the "cursor snaps to screen center" issue some players reported (but also read [url=http://www.bit-tech.net/news/bits/2013/11/04/win81-mouse/1]this for Win8.1[/url]. And also [url=http://us.battle.net/wow/en/forum/topic/9499810106]this on WoW[/url] for a similar issue)