We have Latest Mirasvit Advance Feeds extension installed on our Magento 2.2.2. site PHP 7.1 - all the features of the extension are loading fine apart from the + button in the category mapping section. It basically a button that opens up category lists.
We have tried this extension on same setup but on another server and its working perfectly. other server is also running with php 7.1
After several weeks we are unable to fix this issue on live site with the developer or server hosting company as to what can be causing this issue. The permission / ownerships all seems to be correct and installation and upgrade goes without any errors.
We really need this to show so we can map the categories with googles and create the feeds.
As I said we have same backup on another server and upgraded the extension and its working fine.
The previous version of the extension loads the category mapping button but doesnt after we update or even remove and install from scratch the latest version.