I've recently noticed a folder under my main site structure called "none" that contains many files of type ".body" and ".sizes". Are these related to PageBlaster in any way?

No, PageBlaster doesn't create any folder/files like that, and I have never heard of any files being created outside of the designated PageBlaster cache folder.

Thank you. I didn't think it was PB, but it's recent existence threw me for a loop. I found out it was related to an upload component called "NeatUpload" inadvertently being set to run in a debug mode.