I just tried to post a list of sale items in a Deep Discount sale. The resulting post would've been around 1600 lines long but I kept receiving a response status code 500 (internal server error).

There are a bunch of reasons why you were getting that, and a couple of them are issues we are currently working on.

Did you try re-posting it broken up into separate posts?

Yup, that's what I ended up doing.

This problem *may* have been fixed. At least, I can't replicate the error right now.