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 https://premium.wpmudev.org/forums/topic/new-user-not-being-added-as-admin-to-blog 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?