can't comment about XL kit...

I've had problems with Gefen spliters in the past
try some others - we use TV-One / Kramer / Extron / Procon all with TH2G-D

Do you get an image if you connect an LCD or projector directly to the TH2G? - its a basic test - but could indicate if the TH2G is actually working correctly and the resolution is reported correctly o the LCD (or projector)

S