Premiere Pro Sequences missing, only on first run, serialized Enterprise installation in a Mac OS X Sierra computer lab

I have a university computer lab with Adobe Creative Cloud.

When a student logs into a computer (authentication via Active Directory, creating a local profile directory with /System/Library/User Template/English.lproj as the template directory - which matters not one whit in this issue) and starts Premiere Pro, creating a new project, and then goes to File / New / Sequences, several DVD-related presets are missing.

If he closes the PPro program, and then restarts it, the codecs are now there.

If he then logs out, and a second student then logs in, the codecs are there for the second student as well. But if the computer is rebooted, the computer returns to a standard setup erasing all evidence of the previous session (by design, using an app called DeepFreeze - prevents students from permanent tinkering with the lab image), then the second student can log in after the reboot, and the codecs are missing on the first run of PPro. Closing PPro and restarting it restores the codecs.

I have tried copying a working student profile to the template profile directory; I have tried removing everything from the template profile directory; I have tried reinstalling PPro; I have tried reserializing (it's an Enterprise serialized install, so no Sign-In/Out or De/Re-Activate is possible); I have tried thawing and getting to the point of codecs existing and then re-freezing.

After a week of experimenting, thinking it was in the profile, and then thinking it was in the install, and then thinking it was in the serialization, I'm no closer than when I began, other than knowing a thousand things that does not fix the problem.

If you plan to tell me to reinstall, know that I've done that.

If you plan to tell me to de-activate/re-activate, know that's not an option on an Enterprise install.

If you plan to tell me to generate a new license package and install it, know that I've done that.

If you plan to tell me I did one of these things wrong, then please tell me how I did it wrong and how to fix it.

Thank you.

/Kent