The 2010 LHC beam, despite of its record-breaking stored energy of 30 MJ, has not induced any unintentional quenches of superconducting magnets nor other equipment damage. Nevertheless, a number of unexpected phenomena have been observed, some of them affecting machine operation.
This paper concentrates on understanding of beam losses, with emphasis on UFO phenomena and on accuracy of the present knowledge of the Beam Loss Monitor beam-abort thresholds. It attempts to foresee the problems during LHC run in 2011 and 2012, when intensity, and maybe the energy of the beam, will be significantly increased.