ARGH!!! Trouble here with U46DJ...

So I've just installed the new 1.4 drivers from this site. They seem to work great - BUT - I can't adjust the latency now.
On another DVS system running on the same machine with the same U46DJ and the same drivers I can get it down to 48ms, but in Mixvibes I can't change it from 512ms.
I've tried changing it in the Mixvibes U46DJ control panel, but when I load up mixvibes again it defualts back to 512ms.
Anyone know how I change this???
On another DVS system running on the same machine with the same U46DJ and the same drivers I can get it down to 48ms, but in Mixvibes I can't change it from 512ms.
I've tried changing it in the Mixvibes U46DJ control panel, but when I load up mixvibes again it defualts back to 512ms.
Anyone know how I change this???