Marking text selectively not working or saving

For the past 3 months or so, I have selectively been unable to save a highlighted or underlined selection of text, particularly in conference talks. Sometimes the underlining or highlighting saves, other times it does not. I think I have discovered the commonality between those that don't save: if there's an annotation at the end of the line or sentence, it doesn't save. I initially emailed in August to report the problem, but the problem still exists today. I emailed again today.

Can anyone out there help fix this?

I'm having the same problem. At times, highlighting works well then stops. I remember when it was possible to report problems, but that is no longer available. I prefer to prepare talks and lessons on my PC, but inconsistent highlighting is becoming more difficult.