My iPhone 3GS running iOS5 when using number crashed earlier, when I reopened the app my files were missing. I opened my iPad 2 and fired up numbers to find only two out of my 30 or so files were there, both wouldn't open and refused to be deleted. Starting to worry, I opened iCloud.com on my MacBook to find no files at all. Restarting both Numbers for iOS apps now both show no files. I backed up my numbers files to Dropbox when upgrading to iOS 5, but have made plenty of changes and hold some key information in there. Is there a way to get these files back?