The paper poster correctly lists the key as D Major for Loop 19 (Phillie Cheese) but the scale listed is G Major. You Rock mode also defaults to G Major so it plays C natural instead of C sharp (which to me sounds like a wrong note).

You can change the key of You Rock mode by holding the You Rock button and pressing the root note of the scale on the E string. Low E for major keys and High E for minor keys. Unfortunately the key change is not saved to the preset when you push the Music and Record buttons so you will have to change it every time you want to use You Rock mode.

I was using Loop 12 Rock Rose and the paper poster says it is D Major but under the progression chart it is listed as G Major (which I believe is correct)
The You Rock button also plays in D Major. The note c# sounds particularly bad with this loop so the You Rock button makes the loop sound worse (wrong notes actually play).

I have the latest firmware 1.165