Invalid Project via DropBox on iPad

I use Scrivener for the Mac on my laptop as my main work horse, and then use DropBox to work on projects on my iPad when I travel. Yesterday, my Scrivener files in DropBox stopped working. Every time I try to open one, it says ‘Invalid Project.’ However, when I open the DropBox .scriv file from my laptop, everything is ok.

Things I have tried:

  • Reinstalling Scrivener on my iPad
  • Reinstalling DropBox on my iPad
  • Deleting Scrivener files on DropBox and creating new folder with .scrv files from laptop

Pretty frustrated. This has taken the one day I had set aside lately for writing. Any ideas?