Hi,
I use k2 2.6.9 and joomla 3.4.1 , when I try to add item directly from front end, form checks required extra fields and show error if some fields didn't filled. but when I enable User Extended Fields for K2 (by JoomlaWorks) Plugin, this feature dosen't work and required check isn't work normally,
let me ask you what is this issue and how can I fix it.

thanks.

Hello this has been resolved in the dev version.
You can get the latest build from getk2.org/assets/get/