Toolbars and menu's placed on taskbar in 2.4.12 disappear underneath taskbar

[GertC]

In 2.4.12  toolbars and menu's which I use to have on the taskbar and which showed up in 2.4.11 on top of the taskbar (in all  desktops), now become hidden underneath the taskbar. To test I reverted to 2.4.11 and here they show on top of the taskbar again (in all virtual desktops as well). Not sure if this is a bug.