Whatever the problem was, the new update has the plugin working again. Thanks!
Disabling all plugins save PTE changed nothing.
The logs: http://dpastey.appspot.com//Y5kw/
How do I check to see whether it’s a Windows/Apache server?
This happens for every image, and the WordPress image interface is not the problem.
I tried installing that last night as I saw that listed as a way to get it to work in another thread, but it didn’t change anything – though that may be because I am unfamiliar with manually installing plugins through Filezilla. I also tried that fix with editing lines from another thread to no change.
I thought of it being a problem due to 3.5.1, but was not able to downgrade to 3.5 due to doing something incorrectly, so maybe I’m missing something with the .zip file.