New blogs not getting admin added when created

I've got a problem that looks like it started a few weeks ago and I'm wondering if it is related to the New Blog Template plugin.

When a member (or person just signing up) creates a new blog on the network, they aren't added as the administrator. Like I mentioned, I'm using the new blog template plugin and one of the master accounts is being added (which is just the admin account for the template blog - its a generic account), but the user themselves are not being added. The effect of this is that they have no access to the blog they just created and I have to in and add them manually.

I found another thread from 2010 about this issue but that one was never resolved. Like that guy, I've got nothing in my error logs about this.

Any thoughts? Any else experiencing this?