Vincent and Phil,

Just to clarify, while they are still referred to as "single-user" licenses for sales and marketing purposes, there really isn't any such thing technically - it's actually just a one-user license - but in all other ways functions the same as any other "multi-user" (meaning "more than one user") license. While this may sound pedantic, it's an important difference in discussions like this one.

So, any one-user license will still have a .dfr file and will still limit the number of users (to a single user in this case) using the same underlying mechanism as any other user count.

This doesn't help find out what is going on in Phil's case, but I just didn't want anyone to think there was a different underlying behavior for a "single-user" license.

Note that this was not always true; back before user counting was created, there actually was a difference in how single and multi-user licenses functioned. Single-user licenses did no locking at all.