I'm using a fresh phpBB 1.1.2 jumpbox appliance and am trying to attach several PDF documents to a single post. I am able to attach the first document no problem, but attaching additional PDFs will not take. If I try attaching an image file instead of a second PDF, it works. I've been able to reply to the post and attach additional PDFs with mixed success. I have confirmed this work with a standard phpBB install, it seems to be at jumpbox specific issue.