Case fine, App in iPhone 4 does Not work

Bought a Watershot case for my iPhone 4, downloaded app. Worked for 5 min then froze. Said saving photo and could not get out of that even when powering down and restarting. ( Less important - button 1 does not line up with icon on screen so button non functional without opening case - which cannot be done underwater...)
Deleted and reloaded app three times. Immediately upon opening app says saving photo even if no photo taken , and screen otherwise black. Only way out is to close the App.
Avoid this product - the waterproof case and associated software - until App fixed; at present it is a waste of $$$.

desmd about Watershot for iPhone, v1.6.13