I changed hosting providers when the credit card information expired in May. I was fed up with the non-service that my previous hosting service was providing, so I ponied up for a pricier service that promised more support. And they do respond, even on weekends, which has been a fantastic benefit.
What amazes me, though, is after three months and multiple support cases, I figured out the problem, which turned out to be one missing line from the httpd.conf file in Apache.
LoadModule module_webapp modules/mod_webapp.so
Damn you, mod_webapp!