Thread:Project:Support desk/index file exception on save

Hi all. My first post here.
 * MW: 1.16PHP:5.2.17
 * MySQL: 5.5.20
 * URL: http://www.musicforum.org.au/kbwikipreprod/index.php?title=Overview_of_Music_Statistics:_Other_Sources

The exception error is

Forbidden You don't have permission to access /mediawiki/index.php on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

It occurs when trying to save or preview a page (not just this one) An exception is triggered by certain URLs and not others. In the markup below, converting "http: //www.imc-cim.org/..." to "http://www.imc-cim.org/..." (i.e. dropping the space between the : and the //) triggers it. In fact putting any url there seems to trigger the exception.

Earlier in the page, the work "poker" triggers the exception - avoided if a space is emplaced (po ker) and "casino" has a similar effect. I've looking for a solution for a couple of days without success. Any clues would be most appreciated.

David

PS This may be related to: (Resolved)Are there forbidden character sequences that can cause 404 errors? except I couldn't figure out what had been resolved