[PeterT]

I know I have seen some situations where lines go missing in ePubs with FullScreen mode enabled.

Sure enough, it's still present on a Glo with the released 3.50 f/w. If anyone wants to see it for themselves I've attached the eBook that demonstrates the issue; a one page excerpt from Robert J. Sawyer's Red Planet Blues. The issue appears using Georgia and a Font Size of just over 1/2 on the slider.

At the time I reported it I also included the settings I had in place in the Conf file:

Spoiler:

[Reading]
fullScreenReading=true
libraryBuilderBlueprint=filterByMine()\nremoveReadingStatusFilter()\nviewBy5List()
pageTurningOption=option2
readingAdobeShowPageNumbers=false
readingAlignment=left
readingFontFamily=Georgia
readingFontSharpness\Amasis=-0.0533333333333333
readingFontSharpness\Georgia=-0.0133333333333333
readingFontSharpness\Gill%20Sans=0.0933333333333333
readingFontSize=32
readingFontWeight\Amasis=0.12
readingFontWeight\Georgia=0.18
readingFontWeight\Gill%20Sans=0.48
readingLeftMargin=2
readingLineHeight=1
readingMenuState=
readingRightMargin=2