I'm having a issue in an ePub 3 file viewing in iPad. The text is getting cut off partially or a complete line is disappeared in both top and bottom marigin. ePub 3 file is a two column file. Can someone help me resolving this?
I've seen this happen with EPUB 2-enhanced on the iPad. You can try changing the text size, but the problem will likely move to another point in the content when the text is reflowed.
One thing I checked that really helped prevent the issue was to make sure I had iBooks set to display full screen - this is the fix for the problem you are describing.
However, if switching on full screen does not resolve your problem, or introduces a different problem, you will need to adjust the CSS "page-break-inside: avoid !important;" values associate with classes where you don't want page breaks happening.
Hope this helps!