If you have upgraded to wordpress 2.5 or 2.5.1 ,it is the most likely problem you will find while trying to upload images using media manager.
You will get something like shown below “HTTp Error”

This is a very simple problem,related to the security setting.The default security settings in the .htaccess file of wordpress restricts file upload in wordpress 2.5 and 2.5.1 .
The default WordPress .htaccess in 2.5.X looks like this
# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
# END WordPressNow you need to modify it slighlty in order to make the file uploading work.
Add the following two lines after the wordpres block.
SecFilterEngine Off SecFilterScanPOST Off
so the final .htaccess file looks like
# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
# END WordPress
SecFilterEngine Off
SecFilterScanPOST OffNow the last two line simply makes security Filter engine off allowing the file upload.
That’s all , now upload the modified .htaccess file to the root folder of your wordpress installation.
Suppose you have installed it on www.example.com/blog/ then the .htaccess file must be in /blog folder . That's all ,now go to the write post section and try to upload image, You will find no problems this time.If you enjoyed this post, make sure you subscribe to my RSS feed!
We will keep coming with more informative tips,tricks,tutorials to keep you updated with wordpress/buddypress/wordpress mu regularly.If you want to help us,You can ,by spreading the words.We provide free and premium plugins/support for wordpress Mu,buddypress at a very low cost (starting with $30 for 3 months membership).If you or anyone you know,needs some real good plugins/themes for their wordpress Mu/buddypress powered site, Please refer them to http://BuddyDev.com.We will highly appreciate your support and keep coming with more useful and free stuffs.

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