We have Project Server 2007 running on SharePoint MOSS 2007 and are having a permissions problem with one particular User. We are using Windows Integrated Security, and added a new User to Active Directory and also added him to PWA. He was able to log in to PWA with no problems. The our Network Admin had to delete his User account (for an unrelated email issue) and then recreated the account with the same Username (but of course different guid). After that he started getting "Access Denied" from PWA, so we deactivated and deleted his existing PWA Account and then added a new account for him. However, he is still getting "Access Denied" from PWA/SharePoint. I resync'ed his PWA Account and looked at the permissions list (Site Actions >> Site Settings >> Advanced Permissions). His account was there, with the correct permission level. But when he tried to log in he again got "Access Denied". I looked at the permissions list again and he was gone. I don't have any explanation for this and am stumped for a solution. Any suggestions?