SharkSol Deluxe doesn't open anymore

I can't guaranty this but I'm almost sure that if your device is backed up (in iTunes) your Card Shark save data will be transferred back on when you re-install.
HOWEVER!.. I would definitely recommend you try restarting your device first as this will free up memory that could be taken up by background processes and Apple app caching. I frequently restart my iPod when apps start being flaky. To do this, simply hold down the top (sleep) button until a message to slide to turn off comes up. Alternately, you can force a total shut down by holding both the top button and hom button until the device shuts down. To turn it back on, just hold the top button until the Apple logo comes up on screen. It can take a minute or two for the device to start up after this. I hope this helps. I've bounced your question to our code lead in case he has a more definitive answer about re-installing the app.