Since I upgraded to WordPress 2.7 MU RSS Widgets stopped working, on every blog.
Of course I did all the tricks, restarting webserver, disabling super-cache, reactivating, purging cache folder, etc.
I've even looked into WP_Http class, then I found out every curl request came back with FALSE. So I had to downgrade back to 2.6.5, and now all RSS widgets work again...
I'm using
nginx 0.6.32
php 5.2.6
php-fpm
Any ideas?