Will, Thanks For replying.
Here are details you asked for :
Wp Version : Version 3.8
ACF : Version 4.3.4
Browser : Mozilla
some times it allows me to rearrange fields very first time(Not everytime) when I open site admin panel to manage fields. after that not at all allowing me any editing. however I am able to add new fields.
2022 was a big year for Advanced Custom Fields, with more capabilities, a new generation of ACF Blocks, a refreshed UI, and a new home. Our year in review post looks at advancements we’ve made and offers a glimpse of the future. https://t.co/HahJUCcyH4