button .b -text Foobazzulous -padx 5 ; pack .b
This blots out the edges of the text in the Carbon-based Aqua native version of Tk (all versions I've tried: 8.4.x, 8.5a5). This behavior is not observed on XWindows-based implementations of Tk.
A related concern is a cross-platform incompatibility: a small -padx is necessary in many cases on XWindows versions to avoid the text crowding against the edges of the button, however in Aqua-native such padding is unnecessary. Not sure what to suggest here however.
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Still present in 8.6a1.