Yeha I tried trashing the prefs a number of times but no go. I checked with MOTU they said that the current AU for Reaktor is incompatible with DP4, but that both companies were working aggressively to create a solution.
Checked on the NI forum and apparently a lot of people are having the same issue. The NI rep said that they would be releasing an update shortly...
waiting game now...
thanks-