Inheirited a very smooth shift from Claudia and Enrico, and finished up run 814 at 00:30. We ran at an instantaneous luminosity of around 2.2 x 10^-31 all night. run 814: 186.4 nb^-1 run 815: 181.9 nb^-1 run 816: 183.5 nb^-1 run 817: ongoing a live-time problem was noticed by Keith and Flavio as they came in at the shift break; rather than the usual 97% or so, it was found that the GMout/GMin ratio had fallen to about 84%. This seems to have started around the beginning of run 817. It does not seem to be related to the increased luminosity which we've been running at, as the problem is relatively recent, and we've been running all night at the same instantaneous rate. It was thought that perhaps this was an effect caused by the regulator on the Gas Jet, but when the regulation was turned off, the problem persisted. Keith and Flavio are investigating the problem currently. Todd and Giulio