3D FlipBook - Can't add new posts or edit existing ones.

I've got 1500 PDFs to upload. I've done 92. Now I can't add any more nor can I edit existing ones because after the Title bar is a line that says "Details" and that's it. This occurred after publishing the 92 item. Any suggestions on how to fix this? I've deactivated and reactivated the plugin.

I'd also like a reasonable way of bulk uploading, given the numbers. Having to enter each one individually and publish is a real pain, although I have at least worked out how to apply a template of sorts (by using SQL in the database).