PROOF: TTree::Draw() strangeness with canvas handling

Hello,

I noticed strange things when using the same TTree::Draw() with PROOF multiple times. Eg. when calling

t->Draw("var", "", "", 100);
t->Draw("var", "", "", 100);
t->Draw("var", "", "", 100);
t->Draw("var", "", "", 100);
t->Draw("var", "", "", 100);
t->Draw("var", "", "", 100);
t->Draw("var", "", "", 100);

the scaling of the x axis will vary between calls whereas I'd expect it to be identical every time.

The situation gets worse when opening a second Canvas:

t->Draw("var", "", "", 100);
menu action: File ---> New Canvas
t->Draw("var", "", "", 100);

This time, the newly opened canvas will contain the histogram alright, but at the same time, the histogram is plotted a 2nd time inside the first canvas with all values being multiplied by a factor of two.

How can that happen?

BTW: t->SetProof(false);

removes this kind of strange behaviour.

Thank you and kind regards,

Thiemo

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