Known memory leaks in TCanvas?

[Sergei Mutovkin]

Hello,

our application extensively uses TCanvas to draw diagrams that
are updated every second. After some time Xorg server occupies 80%
of available ram and GUI is unsable.

I'm wondering if there are any known TCanvas problems? What we do
is create a single TCanvas, then fill it with background color and
draw on it, Fill it with color, Draw, etc and we do this constantly.

Thank you very much in advance,
Sergei