Hi Rob and Kevin, One puzzle we have in mucap is loss of islands at the beginning of the data segment. An example is shown in the attachment where the blue curve is the raw time of scintillator hits in the CAEN and the red curve is the raw time of scintillator hits in the WFDs. The problem occurs in both safe mode and unsafe mode. I dont think the wfd start logic is causing the problem. Any ideas? Cheers, Tim.