I use rox pinboard with fvwm. In fvwm I define a strut
that keeps windows from being created on a portion of
the screen (root tail messages). The rox pinboard makes
use of the _NET_WM_STRUT which messes shrinks the size
of the screen that it manages. Here's a patch for the
pin board that disables honoring _NET_WM_STRUT.