SprintPhoto v0.2.1 Requirement
Thanks to Chris, I have found out that there is a requirement for the loadJpeg function used in my SprintPhoto plugin. It looks like the GD Graphics Library is needed to manipulate the images.
If you are getting a problem where the script just seems to fail out, possibly posting plain HTML data to your page, this may be the issue. You can check out the GD library page and install it, but I will be looking into it soon to see if I can remove the requirement for this package.
Thanks again to Chris for finding this requirement, Cat for running into (what I think is) the same problem and both for supplying me with some debug output to help track down this bug.
Check back, when I get some time I will either write up some better instructions on getting the GD library or update the script to deprecate this requirement.