For some reason the dynamic ram build option ( Shift + B ) is no loinger available for my projects. The option is permanently grayed out. Does anyone have any ideas?
Perhaps you've set the Dynamic RAM Preview amount to 0MB (in Options|Preferences|Video) to suit one of the plugins that needs that (e.g. Wax) and forgotten to set it back to some non-zero value when you want to use Dynamic RAM Preview again?
Thanks for the suggestion. I actually figured it out and it is very embarassing. I had not actually set an area of the timeline to preview! duh! fud, fud ( sound of hand hitting head ).