Ios4.1 version versus 3.1.3 version for 3gs??

How come with the 3.1.1 version haypi works perfectly on the lastest version of it? Now if I ever want to go on a different account I have to delte the app whuch takes forever to reinstall it?? Can you guy please fix this??

Exit out of the app
Double tap home button (to get to the multitasking bar)
Hold finger on Haypi until the little "-" comes up, then press on it

This does not delete the app it justs deletes it from the multitasking bar

Then just start the app up again and there you go