build 820 FW1.03a: In alt mode going from user menu to main menu causes two headings (main menu under user menu) and the bottom menu item (Debug Parameters) becomes unreachable.
This did not happen on my old SX10 1.02b.
SX10 101a: after going to main menu, the screen is not refreshed, the old user menu is shown in the background - but all menu items from the main menu are visible & selectable, also the last item in the main menu: "Miscellaneous stuff".
I guess you've got "Debug parameters" in your user menu & you see this item in the (not refreshed) background...