Du hast es doch mit SHAppbarMessage gemacht, oder?
Wenn ja, reagierst du auch auf ABN_POSCHANGED?
*der 1GB R-A-M genail findet*
//noch kurz
psdk-zitat schmeissst
Zitat:
Notifies an appbar when an event has occurred that may affect the appbar's size and position. Events include changes in the taskbar's size, position, and visibility state, as well as the addition, removal, or resizing of another appbar on the same side of the screen.
...
Remarks
An appbar should respond to this notification message by sending the ABM_QUERYPOS and ABM_SETPOS messages. If its position has changed, the appbar should call the MoveWindow function to move itself to the new position.