While building out a staging server for a client, we encountered a strange situation in which TortoiseSVN was unable to check out a working copy of the application. It was getting an "Access is denied" message while trying to write some of the metadata files (in .svn) for an .exe file that was part of the project. The permissions on the folder looked fine. We eventually determined that the TrendMicro OfficeScan real-time virus scanner was causing the problem. After disabling it, we were able to check out the working copy. Subsequent updates with the virus scanner on have worked fine, but we haven't made any changes to .exe files, so we can't say if it's just a checkout issue or if it affects updates too.
