Hi, welcome to iPF!
Try force closing the app.
In iOS 6; double tap Home button to reveal the multitask bar. Tap and hold an app icon until they start to wiggle. Delete the Photos app icon.
In iOS 7: also double tap Home button, then swipe pictures above the app icons towards the top of the screen.
What you also can try to fix this, is restart your iPad (turn it off, wait for a few minutes and turn it on again) and/or reset it (press and hold Home and Power button simultaneously until the Apple logo appears, then release both and let the iPad power up on it's own - you won't lose data or settings).
If this doesn't help, please provide more information, as asked by giradman.