In RMEP 2013 (and only in 2013) we have a fairly regular problem (but not 'reproducable') issue with the drawing area and dialog boxes in Revit. The 'drawing area' will overtake portions of the Properties or Project Browser and at this point zooming will become irregular. Usually the only solution is to exit the software and restart.
See orange circles in attached image.
3d acceleration is turned off already.
Win 7 x64. 8gb RAM
Video Driver is of a version later than the 'certified' version.
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