I apologize, but I'm afraid I am still having problems with this. I have contacted my host a couple times, and they say that they are sure it is not an issue with the server or my php.ini file. I had uploaded the session test page here:
It appears to be working, but still no luck with my login. If it helps, the error I am now getting after log in while it's trying to redirect is shown in the file below.
Thank you again for all the help! I'm afraid I am at a complete loss as to what to do, and I am at the deadline.