I have been using my site all morning and everything was working very nicely when BANG - this happens
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster @ shadows.os42.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.
I wasn't changing anything or doing anything in particular just the occasional post/edit that kind of thing.
I also read something in the forums here recently about this being to do with .htaccess but I cannot see my .htaccess file in my ftp program anymore.
Any ideas as to what/how/why this is happening and how to fix it?