User Access

I have a strange situation here. We are using TortoiseSVN 1.7.11, Build 23600 - 64 Bit , Subversion 1.7.8. I have one user who had access to a specific directory previously and now can't access it. This applies to no one else in the company. I've reinstalled the client on his PC, I've validated his security and setup. I can find no reason for this situation. Any ideas? ANy help woould be greatly appreociated.