I had an working environment, but after updating my image offline with DISM, I also got this problem.
After spending hours going through forums, reading logs and finally start using process monitor I found something really weard. I have a step with "Use MDT toolkit Package" because I need some scripts. There is a folder called Templates\GPOPacks which seemed to be applied with every software. After removing the folder GPOPacks and updating my DP, everything started working again...
/Daniel