The problem is reported in alog: 32148
The LHO DCS cluster seems fine, but the load on the DCS DetChar box is very high. I've sent an email to the DetChar group, Duncan Macleod, and LDAS about this, seeing if Duncan can get the summary page jobs working again, or if the box needs to be rebooted.
The detchar box has been rebooted, the detchar jobs are running again, and detchar has been informed. It may take a while for the summary pages to catch up.