Ok, Wordpress 2.5 is a nice upgrade.
Well it was until I wanted to add some images. The new ‘add media’ link was fine at adding images to a blog post that were already on the computer, but I got http errors when I tried to upload from the computer.
Still do not dispair! Here’s what to do.
Go to the ROOT of your host. (something like home or public_html) and look for the file marked .htacess
If you don’t have one, then you can make one, using your favorite text editor.
You need to add the following:
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>
Save it, upload it back into the root folder, and your image uploading should now work.

