this is the value from the default screen saver:
<element type="SpectrumVisualiser" x="73" y="765" width="1006" height="68" scale="true" fg="80,74,184,237" bdr="180,170,220,250"></element>
when scale="true" MusicBee should scale the y position and width relative to a screen of size: 1152x864
so change it to:
<element type="SpectrumVisualiser" x="2" y="794" width="1148" height="68" scale="true" fg="80,74,184,237" bdr="180,170,220,250"></element>
however i guess it cant be working correctly otherwise it wouldnt display correctly on Greb's screen