Error message "acdwfmarkupcore.crx"

[gccdaemon]

After some windows updates I have users who get an error message loading a drawing with a PDF in it. The error says "C:\Program Files\Autodesk\AutoCAD Civil 3D 2013\acdwfmarkupcore.crx cannot find a dll or other file that it needs." and the PDF's in that drawing come up as unloaded and won't reload. When trying to attach a file to these there is a invalid file message that pops up (see attached). Is anyone familiar with this error? Some users are on MAC which don't have the problem, but win7 ultimate x64 seems to be the only OS this is happening on.

[gccdaemon]

Users are on Civil3D 2013 SP2. Users on SP1 don't seem to have the problem either. Neither do users on non updated OS (the update for win 7 when the win 8.1 update was released).