Following up with a similar issue:
When using ACF Pro and Ultimate Member with WP 4.5.3, there’s a conflict in WP Admin.
When ACF Pro is disabled, Ultimate Member settings work fine: https://infinit.io/_/CRR6wqv
When ACF Pro is enabled, the styling changes, and there seems to be an issue with the z-index (although I don’t see any z-index CSS when inspecting the page code) as the menus fall behind the rest of the interface: https://infinit.io/_/eKyhWMT
I reached out to ACF Pro and their support staff was very helpful, and provided the following feedback which I’m passing along for the UM devs:
I’ve done some debugging through the Ultimate Memebr plugin and found that they are including an older version of the plugin ‘3.4.8’ which uses different class-names than the version that ACF is including (newer) ‘3.5.2’.
This explains why when ACF PRO is active, the select2 elements are different, and the Ultimate Member CSS is not working as expected.
I noticed some code in their enqueue class that checks for the plugin WooCommerce and dequeues the registered Select2 JS/CSS. Perhaps they can do the same for ACF.
Even better, they should consider updating the Select2 version to 3.5.2 (same as ACF and WooCommerce) to allow for better compatibility. They should also consider not including the Select2 JS within a compiled um.min.js file to allow for 3rd party plugins to enqueue the ‘select2’ JS/CSS via WP functions
