Ok so this morning I compiled my map, took me 20 minutes with VVIS and VRAD on normal and HDR (as well as -final on RAD) and everything works fine. Then this afternoon I compile it again and have all the same settings and it doesnt run RAD the second time. No errors anywhere, no notisable changes to the map (have only added more of the same stuff I already have) and it just doesnt run the second RAD needed for HDR. I really don't understand why hammer wont do the second VRAD compile, every now and then it just throws a tantrum and does't compile it for a few days, then decides that it will again. Does anyone else suffer from this as well? Can anyone shed any light on what might be going on?