I am currently having some problems with a large amount of my 10.1.5 users where the logs show that they are downloading the latest definitions from my internal LU server, but they are not getting installed.  When I browse to each computers liveupdate\downloads directory, sure enough they are there...but not installed.  The logs after the definitions have been downloaded say that the definitions are current.  Does the LU utility just look at that downloaded folder, and not the actual version number in the VirusDefs folder?  If I try to push them out through the SSC, I get the same result.  Any help would be greatly appreciated.  I will be happy to give some more info or post logs if need be.