The Kunena team has announce the arrival of Kunena 188.8.131.52 [K 6.1.3] which is now available for download as a native Joomla extension for J! 4.2.x/4.3.x. This version addresses most of the issues that were discovered in K 6.1.0 and issues discovered during the last development stages of K 6.1
If you are having problems then, for your own benefit, it would save us all a lot of time if you would kindly post your configuration report when you ask for help from this forum. If you do not post your configuration report we will not ask you for it but you will probably not get your problem solved, either.