I think that there must be a problem with the support forum on your website and with your email as I have been trying to get some support for an issue I raised via your website's support forum and the email address on your website, but I haven't had any response to my last three emails or to my last support thread update.
I can only think that there's a problem with your forum and with that email address listed on your website.
Anyway, a little over two weeks ago I purchased the upgrade to Pro MU from Pro but the upgrade hasn't taken effect.
I do have the correct version installed (this was confirmed about a week ago), but none of the MU options are showing up on the dashboard (the tab for MU does not appear, nor does the column showing a site's status appear under Network > Sites).
I sent an email to the address on the website to show what I'm talking about, so perhaps looking that up would be helpful.
Anyway, please let me know what's going on and what I need to do to get this functionality working.
The plugin is fantastic and I really want to be able to take full advantage of all of its capabilities.