Log out of iCloud and try resetting your iPad by simultaneously pressing and holding the Home and Sleep/Wake buttons until you see the Apple Logo. This can take up to 15 seconds so be patient and don't release the buttons until the logo appears.
Log into iCloud again and try again to see if the problem persists.
Have you updated to the latest level of Keynote on your iPad? Keynote 2.0.1 (1075) - Check Settings > Keynote
If so, there isn't much that you can do other than report this bug to Apple http://www.apple.com/feedback/ipad.html
You could try restarting or resetting your iPad.
Restart: Press On/Off button until the Slide to Power Off slider appears, select Slide to Power Off and, after the iPad shuts down, then press the On/Off button until the Apple logo appears.
Reset: Press the Home and On/Off buttons at the same time and hold them until the Apple logo appears (about 10 seconds).