I have been using the paid Kami service for many months. Over the last couple of days, I have run into a strange problem. While typing a comment, the comment box would suddently disappear, resulting in loss of comment. Often, the highlight would disappear at the same time and appear a minute later without the comment. This has happened many times in the last two days.
I do often have the same pdf open in multiple browsers. This has not been a problem in the past.
Update 1: the problem seems to happen even if the file is open only in one browser.
Update 2: Now I am seeing this problem all the time. Easy to reproduce.
Update 3: BTW, I am using Chrome on Linux (Centos 7). Previously, when things worked fine, I used Chrome on Mac.