Seems like the latest XDS included a big fix for the processing of weak (i.e. background ~ 0) pilatus data - thanks to Tobias Krojer for the heads-up there. This will involve some slight fixes to the xia2 XDS wrappers, so I will bundle these later today.
N.B. this will require installation of latest XDS!
I should also start to think about how to make fixes like this more responsive... ideas anyone?