^ And does this happen in any other programs? It sounds like some sort of graphics glitch if the background was not moving correctly. I'd recommend first trying this, however I'm not sure if this will actually cause a change if the mouse is acting buggy in the game. http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=43234.0 (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=43234.0) - If that does not work, you should try reinstalling the game from a completely new setup (only the setup, not the patch) from this site's downloads (http://www.feral-heart.com/index.php?option=com_content&view=article&id=23&Itemid=40) section. Make sure you completely uninstall the version you currently have now.
@Takavia - I should probably note that that "Wine" (linkie link: WineHQ (https://www.winehq.org/about/)) program is for systems using Mac, Linux, and similar-operating OS's to allow normally Windows programs to run on Mac, etc. I do not believe it increases the performance of the game, sadly. ;o; If Grey uses windows, I wouldn't think they could download it anyway since it's for the operating systems listed above.