Hi and welcome to the Forum,
When apps are updated, sometimes this is when a glitch will come to light, getting in touch with the developer is the best recourse here to inform them what is going awry. You will usually see the app given another update to address the bug. You can of course get in touch with Apple for a refund on an app which does not perform the way it is advertised.
http://www.apple.com/support/ipad/apps/
http://www.ipadforums.net/ipad-help/6539-how-get-refund-app-itunes-store.html
When an app behaves strangely it is best to close it completely and then relaunch it. From the home screen do the four finger swipe up or double press the home button to reveal your multi task bar. These are all the apps that you have opened at one time. Long press the app until it jiggles and a red minus sign will appear above it. Press the minus sign, this will close the app, not delete it, now press the home button to return to your screen. It's also a good idea to close all these apps, as it helps the iPad run smoothly. See if it is now operating if not a restart and or reset may be needed. A reset in this case will not change anything on your iPad and is akin to rebooting a PC.
Press and hold the power off button, the one at the top right. You will see a slide appear to power off, slide this and the screen will go dark and a Whirly will appear. When the Whirly disappears your iPad is now off. Press the power button again until the Apple logo appears, this will take a few seconds and your iPad will restart. You should restart your iPad occasionally also as it will keep it running well. Now see if it is operating.
Hold the power off button and the home button simultaneously, keep holding them in and you will see the power off slide appear and disappear, wait until you see the Apple logo appear before releasing the buttons. It will take a little longer for your iPad to start.
Let us know if any of the above steps works for you.
iPad 2 3G 64gb