(As of early May 2014.)
Users on iOS 5 will find that their Texpad iOS is having issues accessing their files. Texpad is able to link with Dropbox successfully, but no files or folders appear in the Dropbox file view.
We’ve been notified by Dropbox that this is due to an issue in the Dropbox Sync toolkit, which has now been fixed. The fix will be released with Texpad iOS version 1.6.9 shortly.