Path resolution problem with working copy on NFS share

Hello,

because samba is very slow, today I tried using NFS to access my working copy. Generally it works very well except for the diff feature. In the commit dialog one can usially double-click on a changed file an see the differences. This does not work anymore. Clicking on the "Show differences as unified diff" context menu item reveals a hint as to why: Tortoise somehow appends the .svn/entries path to the complete filename instead of the directory the file is in (see screenshot).

Does anyone here know if this is a Tortoise bug (related to backslashes somehow) an a way around it, or if it's a bug within NFS?

Regards
Wolfgang