Didn't notice any problem with any extensions on the backend or so far as I am aware the front end. If there was a problem with K2 in the past as another reviewer mentioned it has gone now.
Thanks for the excellent work. Makes me proud to be part of the Joomla community.
The only thing that would make it better is if the comments were collapsed which I believe is on the to do list for further articles. Thank you though it does almost exactly what I want and I am very pleased with the component and plug in. Haven't used the module yet but suspect I will want to if and when people start commenting on my articles!