It is the 30th of July and I have just discovered I can't give mod rights to my alts. I can remove the rights but can't grant them back. Same behavior as you have when attempting to give. The only way to unfreeze is to relog or choose "no". I hope they fix it soon, I've been searching Jira for this complaint but can't find it there. Does Labs know about it? It looks like the bug has been there for almost a month now.
I also can't view profiles in V2. I think I have to enable to accept cookies from sites, but I have always kept this feature off. I dun like cookies from sites I don't know. Sooo, I guess I won't be using V2 to grant rights to my alts by looking up their profiles. Back to V 1.2.3. Was a nice brief visit.
Okay, cool! Not a bad move making the web based profile and chat with your friends. I can understand the bug now, lots of programming stuff going on. Nice to be able to do some tasks without logging into SL and get stuck esplaining to contacts you have to log out and just came on to do something quick! I hope you can look up peeps on your friends list in the future. I had to make my alts log in and post a dot so I could get their profiles.