XFce4 - bizarre window placement / work area on Alpha

[Trevor Callow]

Hi,
New to FreeBSD, I hope somebody can shed some light on the following
problem/problems with XFce4 or point me at the right documentation.

Background.
DEC Alpha1000a
-Fresh install of FreeBSD Alpha 5.1 -ok
-configured X on voodoo3
-twm works as it should
-download, compile & install the following
 via CVSup. xfce4-r2
xfce4-desktop-3.99.2_1 xfce4-fm-3.99.2_1   xfce4-fm-icons-3.99.2 xfce4- 
iconbox-3.99.2 xfce4-mcs-manager-3.99.2 xfce4-mcs-plugins-3.99.2_1 xfce4- 
mixer-3.99.2_1 xfce4-panel-3.99.2_1 xfce4-panel-themes-3.99.2_1 xfce4- 
print-3.99.2_1         xfce4-systray-3.99.2_1 xfce4-toys-3.99.2_1 xfce4- 
utils-3.99.2_1 xfce4-wm-3.99.2     xfce4-wm-themes-3.99.2
-all is well no errors etc

Then the problem.
XFce4 started, loads and looks quite nice,
but the work area is displaced up by
2/3 of the screen ie. all windows can not be
moved to the lower 2/3 of the screen and are truncated. This happens in all 
4 work areas.
When displaying a new window they appear either off the top of the screen 
or only the bottom section is partially visible. Have tried various user 
settings but alas to no
avail.
Otherwise all else appears to work quite well ie.
panels, consoles etc.


Thanks

Trevor Callow