Created attachment 7919 Showing at boot & at properties open Two horizontal panels are in use on a single screen, and there is a workspace switcher on each. On the second panel, the switcher opens with only one row while on the first panel it shows 2 rows of the 2x4 eight panels. If the properties of the second panel switcher are opened, the second panel switcher immediately changes to 2 rows as specified in its properties. No other untoward events noticed. Archlinux xfce4-panel 4.12.2-1
*** This bug has been marked as a duplicate of bug 11831 ***