Thanks, Kiki. That's not the issue: the issue was that after Pressing OK in the Edit Tweaks dialogue, I was closing the Preferences and Calibre windows with the keyboard: Alt-F4. Now that I noticed that one must click Apply, I did so and the setting stuck.
I suggest that if one close the window without clickin Apply that he get a warning. Mouse Maids might notice the Apply button, but keyboard users instinctively use the shortcut.
Thanks!
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