[H-GEN] problems with vertical sync rate

[Peter Robinson]

Hi All,

I have been using lectopia to record my lectures.
About 4 weeks ago they 'upgraded' the hardware in one of my lecture 
rooms and the lectopia recordings stopped working - audio OK but no 
video (what my laptop was sending to the data projector).
I was told by the lectopia technicians that my vertical sync rate was 
too high and I should be using 60.

I am running Ubuntu Jaunty on my Dell e6400 (with nvidia card).

My xorg settings were
Section "Monitor"
        Identifier     "Monitor0"
        VendorName     "Unknown"
        ModelName      "Unknown"
        HorizSync       30.0 - 110.0
        VertRefresh     50.0 - 150.0
        Option         "DPMS"
EndSection

and I changed it to
Section "Monitor"
        Identifier     "Monitor0"
        VendorName     "Unknown"
        ModelName      "Unknown"
        HorizSync       30.0 - 60.0
        VertRefresh     50.0 - 60.0
        Option         "DPMS"
EndSection

but the problem persists.

I vaguely remember reading something that suggested the newer Ubuntu's 
don't use xorg as much.
Could this be the problem? In which case what can be done?

Thoughts?

Peter