I have installed WordPress 3.0.3 into a subfolder under the root directory of my website.
The installation works correctly if I leave it as a standalone site. However, if I try to switch it to multisite, that's when my trouble begins. When I add the .htaccess file to the directory, I get a 500 Internal Service Error (it was originally a 403 Forbidden Access error, but after reading a few things on the forum, I got it to the Internal Service Error). If I take the .htaccess file out, the site then works again, but any additional site I try to create (aside from the main site) won't work.
I have an e-mail into my hosting provider about it, but I figured I would ask here to see if anyone else has either encountered this issue or knows a way to fix it.
Thanks in advance.