So I'm a recent convert to XenForo coming from a long and happy existance with vB3, vB4 and a short and angry experience with vB5. My forums still running vB5 but I'm getting XenForo setup and working on the migration. Anyhow I needed to make a post to the vBulletin environment that was a reasonably long wall of text and 6 PDF files ranging in size from 55kb up to 3.5MB for a total of ~9mb of PDF's. I pasted in the wall of text, uploaded the PDF's, clicked post... and I'm still waiting... So I flipped over to my XenForo instance, repeated the process, was happy to see the multiple file upload actually gave me progress bars to indicate it was working, then clicked create and the thread was there... ready for users to consume... Meanwhile back in vB5 land... I load the site in another browser tab, and low and behold despite the fact that my upload/post appears to be hung, the thread is there. Thanks XenForo.