lucy24 - 11:33 am on Jun 24, 2012 (gmt 0)
Hm. Does the code work for your other custom error pages?
Some hosts have an alternative system that doesn't require htaccess at all. There's a list of specific names, like Missing for 404 and Forbidden for 403, that the server is told to look for. If the list includes something for 410, you might try that. (OK, so it probably doesn't include it; I just checked and my own host only has four built-ins.)