apps not working in IOS5 and music missing

I have installed IOS5 on my iPhone 4 and now when I click on most of the apps the screen flashes and the apps dont open. even iBooks doesnt open. yet these same apps open on my ipad2.

Also, all of my music and videos that were on the phone are no longer there. i have turned on iCloud on the phone and on my macbook pro where everything was previously backed up. what am i missing?

thanks

Michael