[odamizu]

Not working for me either on iPad Air and iPhone 6, iOS 9.3.2.

Interestingly, in a couple books it works on some words (e.g., chapter heads), but not all. A quick and cursory check of the CSS suggests that if font-size is defined in CSS, using the +/- controls to change font-size works. But if font-size is not defined in CSS, the +/- controls do nothing.

This was a QUICK AND CURSORY check. I did not dig deep or test thoroughly, and I have no idea if this is the source of the problem or just a coincidence. I offer this quick and cursory observation just in case it helps.

I also tried resetting all settings to default, restarting Marvin, AND deleting Marvin altogether then downloading fresh copy from App Store. None of it helped.