I am having the same difficulty. Before the upgrade I did not have a passcode for my ipad2. Now I need a passcode. Going to Europe tomorrow and need this fixed!!!!!
Hope someone can help us soon.
Similar problem here. I upgraded from an iPhone 4 to a 5 and also have an iPad. Since I don't use the 4 that much, I upgraded it to iOS 7 as a test without disrupting my iPhone 5 or iPad. After the upgrade, I have had problems with my iPhpne 5- still on iOS 6 - not accepting my passcode. I've been able to resolve it by turning off my iOS 7 device and removing it from my iTunes account, however tongiht it has locked up and won't let me in. Same thing for my iPad - which is Wifi only. I would hope that upgrading one device to iOS 7 doesn't force you to upgrade all of your devices. I tend to be careful with major upgrades since I use my devices for both work and personal use.
Very frustrating and it looks like I am going to have to do a wipe and restore just to get a phone working again. I can live without the apps and other stuff for a period of time but basic phone service is a necessity. Not very happy with this experience. It concerns me that an upgrade to once device can affect other devices on the older software.
I have the same problem. Yesterday the iPad was fine, I went to use it this moring and all of a sudden it's asking for a pass code. I didn't even know I had set one up. The ipad keeps telling me it's disabled.
Not happy at all and don't know what to do.