Clipping planes are messed up

For the last 1-2 months I have noticed that anything that uses clipping planes causes weird visual bugs on the model being clipped and anything behind it. I have tried removing all addons and my lua folder and even a complete re-install of Garrysmod. Here are some examples of the bug:
http://cloud.steampowered.com/ugc/614973792717356724/8E59EC072D3C94F12EF16FFA8274EE411BA8ED6C/
http://cloud.steampowered.com/ugc/614973792717354899/C106C45D378BC1A9FF508DDF902B35614223637D/
http://cloud.steampowered.com/ugc/614973792717358705/BD1C3731D3CC15F3C1CE6A9DCA2875A6128190D6/

Anyone have any ideas? This makes things very difficult to develop anything related to clipping planes as they are even more broken then just the graphical bugs.