I got an exception on update; Windows 7 Home Premium 64-bit. I have been using Tortoise for over a year without problem. I don't think I was doing anything unusual today except for having a large number of unversioned binary files in the folder.
--------------------------- Subversion Exception! --------------------------- ... In file 'D:\Development\SVN\Releases\TortoiseSVN-1.7.3\ext\subversion\subversion\libsvn_wc\update_editor.c' line 1583: assertion failed (action == svn_wc_conflict_action_edit || action == svn_wc_conflict_action_delete || action == svn_wc_conflict_action_replace) --------------------------- OK ---------------------------