When updating/changing the master image we always use BIS-F when shutting down before snapshotting. As I said it cleans all sorts of caches, logs and unnecessary data. I can only encourage everyone to do this as you can never expect what Windows does in the background. I'm currently troubleshooting 1909 for a new master image and apparently so much has changed in the user creation process that our login times have gone from ~50 seconds to ~120-160 seconds and I can't figure out why.
Best regards,
Raetke