I couldn't find this being discussed anywhere else (if it has been discussed, please point me to the thread). When I try sending a large file (for example, a 500MB video I edited and uploaded to Dropbox) from one app to another using iOS's "Open In..." functionality, the file transfer starts and then aborts soon thereafter. When I 1st execute the "Open In...", I notice that space for the file is reserved (the free space on my iPad drops by 500MB), but after a minutes or so the space magically comes back and the file is never sent to the app I selected from the "Open In..." menu. I know this used to work with large files because in the past (as recently as 2 weeks ago) I've sent video files as large as 1.5GB from the Dropbox app to Goodreader and Goodplayer. I found this same problem addressed in the 3rd question of the iCab FAQ. http://www.icab-mobile.de/faq.html This new "feature" of iOS 5 makes the iPad much less useful for seamlessly moving my video files around.