not sure how audition works as i use cubase. but i normally add a instrument track first which then asks for the vsti you would like to use. i have addictive drums too, do you mean that wont load now? re-install if so.
what is your computer spec. try changing buffer size and sample rate (should be in device setup) a higher size in these normally makes for better quality recordings but eats up more cpu.
addictive drums does use quite a bit of cpu (mainly on start up)
hope this helps