another interesting point to point out when people are looking to change recording directories that I just found out while testing some ideas in the myth_player source code:
You do have some other options for naming conventions. The only requirement is that the path somewhere contains "tv_shows". This is how LMCE determines what recording are new MythTV recordings - if the path contains tv_shows, and there are no attributes set in the database. Failing to abide by this rule, mythtv would still work, but the shows would not be automatically added to the LMCE database and appear in the datagrid. Though, this can be used to one's advantage if they didn't want recorded MythTV shows to appear in the LMCE database.
rdmustang: there is no reason for your symlink to disappear like that - very strange.
Have you changed your front-end settings to point to the new path?