Report Not bursting

We've got a report that we can get to burst in our LBI Test environment, but not in our LBI Production environment. It's the SAME report. We've compared all of the setups including the backend data-sources. They seem to be identical. We're running the same version of LBI in Test and Prod: 10-6-27-0-400 The report in Prod runs everyday... just returns everything in a .pdf attachment vs just the stuff that the users are concerned with in a .pdf attachment. We just can't seem to get it to burst. Any suggestions?