I just found out that the TeeTree 2.0 source which is delivered with TeeChart 7.07 is more recent than the TeeTree 2.0 code which you can download separately from the web site.

I'm using version TeeTree 2.0 which I downloaded about one month ago. It is the Delphi 6 code for TeeChart 7.
I just downloaded TeeTree 2 from the web site again but this bug is still in the original code.

I met a exception in TeeTree.pas.
Line 5951 reads:
for t:= 0 to Length(tmpCurve) do

I think this should be (but I don't know the code in detail)
for t:= 0 to Length(tmpCurve)-1 do

Or am I wrong?