Thanks a lot for this workaround!
For reference: Values for theta and phi seem to be:
[code] // xz
canvas->SetTheta(0);
canvas->SetPhi(0);
// yz
canvas->SetTheta(0);
canvas->SetPhi(-90);
// xy
canvas->SetTheta(90);
canvas->SetPhi(0);
[/code]
Cheers,
Bjorn