I had the stable version of K2 2.0 installed, and when I upgraded the component to 2.1, all my formatting was messed up, and I can't seem to fix it. Is there any way to downgrade back to 2.0 and recover what I had before?

Hi. Why you lost your formatting? Did you have changed any component files? You should make changes only to template files otherwise an update will overwrite your changes. Of course this is for all Joomla! extensions not just for K2....

Same things has happend to me, all formating has completly dropped out of items

Found the soloution to this. Go to K2 configuration and look for "Introtext HTML cleanup (tag strip)" and "Fulltext HTML cleanup (tag strip)" change both of these from "yes" to "no" and problem fixed.

I think it would be worth having this added to any upgrade docs or notes