tkpath's code under OS X isn't drawing relative to the canvas widget, but relative to the toplevel window that the canvas is in. Easy example:
Run any demo in the demos directory.
Resize the window larger.
Note that the canvas stays centered in the toplevel, but tkpath keeps drawing from the toplevel's origin, and not from the canvas' origin.
Also related, tkpath is not clipping to the canvas, but will draw over anything.
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This appears to have been fixed in 0.3.1.