No scroll in dynamic panel when changing from Auto to Custom device

I have a prototype with a side menu that scrolls. It works fine when Page dimensions is set to Auto or web but when changing to a custom size, in this case 1440 x 820, the scrolling no longer works. Looking in the forum this seem to have been an issue already in RP9.
Anyone else that have the same issue? Is there a workaround?
Thanks,