Hi, I'm running my file over a limited sample to test it. My sample is small enough that there are not all of the event types present that I anticipate in the full sample. As a result, some of my Branches have TClonesArrays with zero members. When I run my Tree-maker with all branches present, I get zero entries in all branches. If I turn off all branches except one, which has entries in the TClonesArray, I get a good tree. By the way, all branches consist of a single object, which has a good default constructor; by default, a TClonesArray is created for a specific object, and with a specific maximum number of elements -- I just don't always put any elements in before I fill the tree. Does anybody else get this behavior? For instance, if you have an event with zero tracks, does that wreck your tree? If you have track-finding turned off or something so *every* event has no tracks, does that wreck your tree? (Since this is a three-day weekend for us, I have the luxury of testing my code with the entire sample this one time, but it is hard to justify during the week.) - John
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