Image upload problem

Hi there,

I have run into a sticky problem on my latest WordPress install.

When I try and upload an image in the media browser, the image appears to upload, but on completion no thumbnail appears, giving me the image alt text/red X instead. Then, when I go to “edit media”, the full size image magically appears (but still no thumbnail). The URL given for the image at the bottom of the “edit media” window doesn’t work:

‘https://www.mysite.co.uk/wp-content/uploads/2011/08/IMG_0498.jpg’

No file of that name is there.

If I copy the URL of the image displayed in the “Edit media” window I get this:

‘https://www.mysite.co.uk/wp-admin/admin-ajax.php?action=imgedit-preview&_ajax_nonce=36892c60ff&postid=672&rand=97930’

So I think that the files are being uploaded to the wrong place.

NextGen Gallery plugin on the same install works okay, except that you can’t edit the thumbnail – the loader icon just goes round and round. On closer inspection I see that NextGen manages to create thumbnails, but then for some reason won’t let you edit them.

Could it be problem with my .htaccess file? Here it is:

‘# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress’

To cap it all, on my mac everything works fine, it just seems to be IE8 and firefox on windows XP that doesn’t work, which also happens to be the setup my client is using, and they can’t upgrade.

I have another client running an identical install, plugin-wise, and they can upload images no problem on their windows XP system. The only difference is that they are running WP 3.1.1. Has something changed between 3.1.1 and 3.2.1 that might explain this?

Thanks in advance for your help!