@grannyGrumpy
Quote:
I wish some other XP or Vista users would confirm or deny this.
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I tried with my old computer (Vista Home Basic) and everything works fine. Sorry.

So for me it works for Linux Mint Debian Edition (64b), W7 (64b) and Vista (32b).
BTW when the preview window is active, the left Ctrl key with + or - on the numeric keypad do the trick. To reset though, I must use the 0 key on top of the keyboard.
Maybe a complete reinstall of Sigil could help?
Anyway, have a nice day!