Many thanks for help, > I have the impression that you are running in batch mode. This is the > case when you do not define a TApplication object or if explictly > you call gROOT->SetBatch(kTRUE); Please check. I do not create "TApplication" (and I do not say "gROOT->SetBatch(kTRUE)"). Earlier today I had the idea to try "gROOT->SetBatch(kFALSE)" just before making the new TCanvas, but it didn't help. Can I somehow convince TROOT to draw my TCanvas without creating the "TApplication" ? > About your point with c->Draw, you should not do: > c->Draw(); c->Update(); > but > c->Modified(); c->Update(); This code is more than one year old (was running fine with 3.02, if I remember well). It redraws the canvas using new contents of histograms every 10 seconds. The sequence "c->Draw(); c->Update();" was found EXPERIMENTALLY by me. No other sequence was behaving properly (including "c->Modified(); c->Update();"). It may well be that now I can change it. Well, I could make some tests ... as soon as I get the canvas drawn. Thanks in advance, Jacek.
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