too_much_information - 4:23 am on Aug 10, 2010 (gmt 0)
Alright, I got it working again. The GD Library is the way to go, it is much faster and the resulting thumbs are much smaller than what I was getting with phpthumb.
In the end, turning on my error messages helped me find three errors in the code. One being that I had a bad file name and the others having to do with my database values for another part of the script.
Thanks for the help guys!