I get a "download index.php" from this site when posting

[G6™]

I wonder why i get this "download index.php" frame every time I hit the Post button for a reply or a new post.
Even get it from some of the forums when i try to open them.

I havent seen that before here, but yesterday after i had that blank screen all morning, i get this strange thing 

[Leipe Po]

is that still a problem? its should be corrected now...

[G6™]

Yes, when i click the Post button that frame pops up asking me to download or read the index.php file.
I click abort and then i cant click on anything other than the linkbar (forum, help, Search etc)
But the post seem to be posted, when i go back to the forum and thread i wanted to post in, my post is made 

Got it right now to when i wanted to post this
I attache a screenshot of it

[Miles Lombardi]

I'm getting it for some reason (Firefox).

Supposedly my computer can open phpfiles, which is weird :S.

[mytreo]

I am getting this too. FF 1.5.0.3. Seems to be a problem with the redirect after posting, I imagine it is sending bad headers for some reason.

[mytreo]

BTW it's a lousy advert for SMF when their own forum has such bugs and is so slow

[kegobeer]

Site admins are aware of this problem and are working the issue.