You mention "I have tried linking the file to a blank project." Not sure what you mean here. What file are you linking? Are the problems occuring with a single project or also with new projects? Which operating system?
Did the problems start recently? Did something happen in this period (e.g. updates, new software).
Do you have (many) add-ins running in Revit.
How is your hardware (e.g. enough memory, enough space on hard-disks, processor, graphics card),
Things to try.
-Update windows (e.g. .Net Libraries, DirectX)
-Update Revit.
-Update Graphics Card Drivers.
-Remove Revit Add-ins.
-Disable firewalls & virusscanners (make sure not on network/internet to stay save)
-Return to an earlier restore point.
-Reinstall Revit.
-Reinstall Windows & Revit.
-Upgrade Hardware.
Louis
![EESignature EESignature](http://autodesk.i.lithium.com/t5/image/serverpage/image-id/1272565i464DC3DC646B4F11/image-size/original)
Please mention Revit version, especially when uploading Revit files.