Hi, I've just updated the IOS on Iphone 4 and had the DB_IO_Error. Tried all solutions but after changining the Skype settings Go offline to 'immediately' and autolog to 'off', I restarted the phone and now I can log in to Skype.
I'm getting this same error on Aug 23, 2013. I have the latest version of Skype for iPhone and it doesn't fix the problem. I can sign in on my PC's, but not on my iPhone.
I read that deleting Skype from the iPhone and re-downloading solved the problem for someone else. And it just did for me, too. Thanks, community.