Greetings, I have a somewhat complicated question (problem) with a TTree. I'm trying to store into a TTree a TMap that maps TObjStrings to complex objects. These complex objects come in 4 flavors: 1) Objects that contain simple Int_t(s) and Float_t(s). 2) Objects that contain (among other things) TH1(s). 3) Objects that contain TMap(s) that map TObjStrings to the equivalent of your TObjNum. (I use this as a histogram for TObjString(s)) 4) Objects that contain (among other things) TMap(s) that map TObjString(s) to Objects like (3) above. (These are used as 2D TObjString histograms) These 4 objects are all built of a common ABC and all of my access to them are trough the virtual methods in the ABC. I have been able to create and store these TMap of complex objects successfully (I think), and I can successfully retrieve any one of the TMaps using the GetEvent() method. The trouble comes when I call the GetEvent() method the second time. The TMap returned by the second call to GetEvent() has some problems: The objects of type (1) above are always correct. The objects of type (2) above are always correct but I get the following warning: "Warning in <TH1::Build>:Replacing existing histogram: RunOutFloatHistogram". The objects of types (3) and (4) are slightly mangled. (some of the TObjNum(s) contain values that are off by +- 1 and sometime the TObjString(s) are not correct) Again the problem never occurs on the first call to GetEvent() no matter what event number I ask for and it always occurs on subsequent calls to GetEvent(). I'm not sure where to look for my problem. Could it be because I'm having some problems with destructors? When is TH1::Build() called and should I make the equivalent of it for objects (3) and (4)? I've looked at the code and I'm not sure exactly what it does. Any help would be appreciated. Jim White
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