I submitted 11 photos at various agencies a few days ago with a model release. They have been accepted at some agencies and still in the queue at others.

Fotolia accepted one photo, and then rejected the next eight (other still in queue) due to problems with the model release. The rejected ones had the exact same release on it as the approved one.
A few reasons I could think of for rejection:
1. It is dark due to the model printing it, filling it in, taking a photo (she had no fax) and then sending it back. Then I printed it, filled in my info and scanned it for upload. So the quality is not as good as a straight scan due the the photograph, but it is still perfectly legible.
2. Most of it is in English, but the model signed in Chinese as she has no English signature.

But neither explains why it was approved for one of the photos and not the others.
Any idea why they would do this?

Update: Five minutes after posting this, three of the files were accepted. (I resubmitted them with the same release last night).  Maybe it is a case of which reviewer you get.