I didn't have this problem with Sametime, but I can only suggest trying to down the server and run at the database locally via a drive mapping. If you tried that and it failed, then I don't have a way of helping you. If you have to reinstall, look at the stauths.ntf and see what entries are in it. You will want to put your admin group in that ACL with  entries so that the group is put into the ACL of the nsf when it is created.
Dig Deeper on Domino Resources - Part 5
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