WordPress version 3.3.1 & Buddypress 1.5.5 not running MU. I attempted manually installing WordPress on my NS account but I was unable to get it working (was getting a database error, though I could connect and execute commands via MySQL Workbench CE and my wp-config.php file was correct). Therefore, I used the NS install script & dropped all the default tables / replaced with my data & replaced the files with my files.
All other uploaded images work fine–for example, the images uplaoded via the wp-admin media page.