|If it was working right It may be the Photo app not working as it should, I guess.|
My suggestion for you is first turn off the iPad. Not the same as stand by.
Step 1 Press the power button until you get the red slide bar to turn off. When is off, turn it on again. This process is a restart and it clears the memory and loads everything again, so it should correct any app not working well. It is recommended to do a restart from time to time.
Step 2 If you installed a third party image or photo app, reinstall this app as it may be having a conflict with Apple's Photo app. Go to iTunes with your iPad connected and on DEVICES select your iPad. Hit the Apps tab, look for the image app (if this is your case) and uncheck it. Then press Sync or Apply. Now check the app again and press Sync or Apply, again. This is a reinstall.
Step 3 If you did the first step and it did not solved your problem you may need to restore your iPad using iTunes, as there is no way to just uninstall this app alone. Do a back up of important files first.
Follow this link on Computing.net for a How-to Restore your iPad:
I hope it helps you