I was trying to grant access to a customer so they could take a look at the kinds of stats that are available, to see whether they wanted to use Google Analytics on their own site.
They didn't have a GMail account, so I sent them one of my invites so they could set one up.
After they'd done so, they let me know what their new account email was and I granted it view-only acccess via the Access Manager.
However, when they then logged into Google Analytics, they found themselves presented with a 'provisioning' page inviting them to "Sign Up for Google Analytics" instead of anywhere that had any link to the reports they should have been able to see.
I then set myself up a new GMail account and granted it the necessary view-only access so I could check - and I had the same problem.
Both my customer and my new accounts were of the form [something]@googlemail.com but when I logged in with my new account I noticed that in the header of Google page it had [something]@gmail.com instead.
Purely on a hunch, I went back and added the @gmail.com variants via the Access Manager and hey presto, both now have view-only access to the reports.
I don't know precisely what this means, in terms of bugs or otherwise at Google, but I've let them know.
This message is posted here in case anyone else encounters a similar problem.