[Mediawiki-l] Problem uploading Files

[Rob Sharp]

Morning all,

I've installed a fresh copy of Mediawiki on an Ubunto 7.10 server. 
This is on a private network.

Here is the Version output:-

     * MediaWiki: 1.11.0
     * PHP: 5.2.3-1ubuntu6.3 (apache2handler)
     * MySQL: 5.0.45-Debian_1ubuntu3.1-log


I'm having trouble with the Upload Files option.

I'm trying to upload a .png image file. Initially when selected I was 
getting a message along the lines of an invalid filetype despite png 
being an allowed extension. I disabled mimetype checking to get round 
this.

Now I receive the following emssage whenever I try to upload anything:-

Upload warning
This file contains HTML or script code that may be erroneously be 
interpreted by a web browser.

Any ideas how I can correct this?

The images directory on my server is publically writeable.

Rob