Yes that does sound rather inconvenient! I'm not aware of issues specifically along those lines no. Although, there was one person recently I helped where some of the web templates in the surgemail/web directory had gotten corrupt. I'm not sure why it happened in the first place, but at this point there was only one report of that and running the upgrade installer again resolved that for the admin in question.
So have a look at the relevant templates in the surgemail/web directory and compare them to the files in the distribution to see if there are significant obviously corrupt differences. Other than that, have a look at the mail.log or mail.err to see if there are any errors getting logged in terms of access permission issues or other problems.
Let us know how you go thanks.
Marijn
About a week after I upgraded to 6.3c2-2 my menu frame has disappeared, all I get now is the welcome page in a normal non frame page, no menu on the left I have the same problem on firefox, safari, and chrome, I have tried from multiple computers with the same problem, the url is I use is https://mymailserver:7025/cgi/admin.cgi it's kinda tuff managing a mail server with no menu. anyone else experience this problem or have any suggestions.
Thanks
-John
