Woah, slow down there my friends. This issue is most definitely not resolved on the i5 haswell NUC. I have one, with ME, and DD+ doesn't work, except with the workaround described above.
I just verified that I have the following Intel services running:
ME Service
Capability licensing service interface
Capability licensing service TCP IP interface
Content protection HECI service
Dynamic Application loader Host interface service
Management and security application local management service
(plus 4 more wireless drivers)
How can I test the protected audio path? I do have a usb bluray drive, but I don't have any BD software on the NUC.