The Kunena team has announce the arrival of Kunena 6.2.6 [K 6.2.6] which is now available for download as a native Joomla extension for J! 4.4.x/5.0.x. This version addresses most of the issues that were discovered in K 6.1 / K 6.2 and issues discovered during the last development stages of K 6.2
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I never could recreate the problem reported by one of our members. I've read all the postings on this thread and don't see that I have the same problem damsella had. My settings on the backend are ok (default 1800 seconds and "New Post" indicator text).
Yes, mine seems to be working okay now, to be quite honest I had forgotten about it. However, I carried out the update to 1.5.10 yesterday which may have fixed the problem. However I have now got to uninstall it and go back to 1.5.9 so I will doublecheck that the setting stays the same. Anyway, at least we know what the problem was and how to fix it if it happens again. Thank you everyone for sorting this out.