I'm having trouble with AirDrop on my iMac https://forums.macrumors.com/threads/1595371/. It is an open case with Apple Support going on for over 2 weeks. While waiting for the engineers to get back to us, the support technician suggested I try this, since I hadn't used the combo update, in case there is a corrupt or missing file that might get corrected in the process without having to do a fresh re-install. I haven't done it yet because I'm wondering if doing this could cause even more problems. We have eliminated Intego security software as the source of problem and wi-fi signal in the house is good.Why do you need to redo the update as a combo?
Thank you. Then I guess at this point I have nothing to lose by trying this and hoping for a miracle cureInstalling the 10.8.4 Combo Update over 10.8.4 will cause no problems. Just check for any updates that might be available after you do that.