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That's my fault, I just realized a few days ago that, when I used fixed point size for font definitions in the CSS files, the ePub book font was not resizeable anymore.
The solution is to use percentage, or ems, but the inconvenient is that it is a relative size definition... So whenever you want to change the global font size, instead of changing only the absolute font size (in points) in the body declaration, and leaving the relative definitions as is, you have to change _everything_... and this is a huge pain in the ***.
Luckily, there is a Calibre option for this, which is "font size key" ... Using this when converting a file to Epub, Calibre automatically replaces all the relative font sizes.
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