Wrong roles configuration link when group type contains underscore

My first attempt to use organic groups went fine. I was able to use Configuration > Organic Groups > Roles Overview > My Group > edit to change the roles for my group type. The problem occurred when I tried to add another organic group type and to do the same thing. When I click on Configuration > Organic Groups > Roles Overview > My Group > edit (for the new group type), rather than being taken to a screen that lists my new group type's (default) roles, as expected, my screen refreshes and I end up back on the same screen (listing my available group types). I thus cannot change the roles of the new group type I'm trying to set up.

I've poked around in the code (not really a PHP programmer) and in the database to try to figure out what's going on, but I do not "see it" yet. I've contributed a few minor bug fixes back to Drupal over the last few weeks as I've needed to get my site working, but the OG set-up is a little much for me to grok at the moment. What could cause the behavior I'm seeing? The problem has not killed my web site, so it's not critical, but it's blocking progress in my project, so I have marked it as major. If others are experiencing it (I don't see evidence of that) then perhaps it is critical. In any case, thank you, if you're a developer and/or familiar with the OG internals, for any insight you can provide as to causes and remedies for what I'm experiencing.