This is a bit of a techy one, but its got me stumped.
When I try and visit the homepage of my website, I get a download dialog saying "you have chosen to open www.mysite.co.uk which is a application/x-hhtpd-php53 file".
Oddly, all other pages work fine. I have looked at the htaccess and there is nothing unusual. Another quirk is that if you visit www.mysite.co.uk?flush=all, it loads fine. If you then go back to the homepage (I supposse the new cached version) you get the download again.
I have tried disabling the cache in the config file, but this doesn't help.
Its an odd one. Any thoughts?