There is a potential conflict between Fusionware, LT 2013 for Windows, and the Mac OS.
The simple solution is likely to either use LT for Mac. (You have indicated an unwillingness) or change the emulated use of Windows from Fusionware to Parallels.
Or move to a PC based system.
Someone needs to make a decision in your company and get everyone on the same OS or continue to have these issues and find possible workarounds.
As the first sentence indicated until you hit on the right combination of factors you may remain at the mercy of this conflict.
Just to follow up on that one Dean, any AutoCAD LT 2013 licenses can be utilized on either a Mac or PC using the same Serial Number and corresponding Product Key (MAC: 827E1, PC: 057E1).
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