does the jdb file vanishes from the folder?
from the log it looks like the update has been successful for AV
LiveUpdate has called the last callback for product SESM AntiVirus Client Win64, so LiveUpdate is informing the callback proxy that it can exit.
2013-07-22, 10:00:58 GMT -> Progress Update: PATCH_PROCESSING_FINISH: Number of patches: 4, Num successful: 2
2013-07-22, 10:00:58 GMT -> EVENT - PRODUCT UPDATE SUCCEEDED EVENT - Update available for SEPM Virus Definitions Win32 12.1 RU2 H - MicroDefsB.CurDefs - SymAllLanguages. Update for CurDefs takes product from update 0 to 130721020. Server name - liveupdate.symantecliveupdate.com, Update file - 1374471972jtun_sep12enncur26.m26, Signer - cn=Symantec Corporation,ou=Locality - Culver City,ou=Product Group - LiveUpdate,ou=SymSignature 2005,o=Symantec Corporation, package install code 0. The Update executed with a result code of 1800, => Sukces
2013-07-22, 10:00:58 GMT -> EVENT - PRODUCT UPDATE SUCCEEDED EVENT - Update available for SEPM Virus Definitions Win64 (x64) 12.1 RU2 H - MicroDefsB.CurDefs - SymAllLanguages. Update for CurDefs takes product from update 0 to 130721020. Server name - liveupdate.symantecliveupdate.com, Update file - 1374471972jtun_emt64sep12enccur26.m26, Signer - cn=Symantec Corporation,ou=Locality - Culver City,ou=Product Group - LiveUpdate,ou=SymSignature 2005,o=Symantec Corporation, package install code 0. The Update executed with a result code of 1800, => Sukces
if the issue still exist, reinstall LU.