Ok.....now my last post got mysteriously deleted.
I installed WordPress at my 1&1 host. I am currently using SMF and trying to switch to WordPress. After the install I can't upload plugins from the web page plugins admin. I can manually upload them with FTP, but then they still won't update even after their activated. I've tried to install Buddy Press and Mingle forums. When I activate them I get a 500 internal error and sometimes I'll get "Error 139 (net::ERR_TEMPORARILY_THROTTLED):Unknown error".
I also have problems with uploading themes, but sometimes that'll work and sometimes not.