For the collision operator, It just checks to make sure that you CAN get a Krakatoa license but it doesn’t actually consume one. If you are having it do nothing when you submit render jobs, it may be a bug in our licensing code. Try setting HKEY_LOCAL_MACHINE/Software/FLEXlm License Manager/THINKBOX_LICENSE_FILE to “@yourlicenseserverhostname” and see if that helps.
There is a new build of Krakatoa we are testing that should resolve this problem. You can get it from the beta section of our download page. http://www.thinkboxsoftware.com/krakatoa-downloads/builds-beta/