Adding threads with xThreads fields (file0 with PHP

[ZiNgA BuRgA]

I suspect it may be breaking because you aren't actually uploading any files - I believe PHP doesn't get fooled if you try to overwrite the $_FILES variable that is, at least with its is_uploaded_file function.

I probably would've just simulated someone actually posting (ie via cURL) if you wanted to do a bulk import, but in the case of XThreads, you could:
a) point it to the URL of the image (rather than the file), or
b) use the special "file://" handler (see the included documentation)