Hi,
(using JIRA 4.4.3)
I'm using JIRA as a database of issues, with me as the only user. Now I think I've managed to sc*** the permission set for the admin-group. When ever I try to access te administration section I get the password prompt as usual, but the next screen turns out blank.

I've reinstalled JIRA with the same result (I've imported a backup) and of course tried different browsers.