I'm experiencing similar behavior. I can move windows around and that's fine, but as soon as I try to resize them they snap back to some anchor position on the screen. I'm not certain on the exact cause, but I do frequently change screen resolutions and use RealVNC extensively.
However, I noticed from balupton's list a common application and that's Divvy. For this week I quit Divvy and so far the problem has not recurred for me. I've opend Apple bug ID 16573875 and sent an email to Divvy support to take a look into this.
I'll add that when the problem occurred, moving the Dock seemed to fix the issue for me.
Video example of the issue:
http://jonsview.com/wp-content/uploads/2014/04/OSX-1092-UI-Glitch.mp4
Message was edited by: jmstacey