Did you try adding a credit card to your PayPal account? Otherwise, the lifetime option will work. Unfortunately it is a PayPal issue only affecting Germany.
There was an update to the Shutdown feature in PinballX a couple of days ago so please download and install the latest version again. It may have the same version number.
I'll take a look at this. So have I get this right that the issue just affects custom menus? The views are supposed to be independent, per system, per page. So maybe it is a bug.