I finally updated my Libra to 4.25.15875 (just couldn't find the time earlier) and re-applied the patches. Immediately I encountered a glaring issue with epubs: widows and orphans in the css (set to 1) are not honored and instead default to 2. I don't know what to do. They are set to 1 in the css, as I said, and the patch for this recommends using the css. Should I apply the patch nonetheless? I'm very unhappy with those large bottom gaps in my epubs now.