Steve,
Just hit VNAV again. The default mode for VNAV if the path. What I was hinting at though earlier is that if you hit VNAV and your above the path, the aircraft might simply dive for the path and the speed will rapidly increase, unless you use VNAV SPD.
BOAC - It's what we needed to get the V/S that was demanded by the FMC for the path. I forget exact figures it may not have been quite that dramatic, but we we're 2000" high and it was commanding 2500fpm in the descent to catch it!
Horgy