Advanced Custom Fields Pro 6.4.0.1

Improvement - Field group and field rows no longer animate on hover to reveal the action links
Fix - Field order is now saved correctly when fields are reordered
Fix - WordPress notice styles outside of ACF's admin screens are no longer affected by the plugin's CSS

New - ACF now has a new refreshed UI with improved UX for editing field groups, including a new tabbed settings layout for fields. Third party ACF extension plugin developers can read more about the optional changes they can make to support the new tabs in our release announcement post
New - Repeaters now have an optional "Pagination" setting which can be used to control the number of rows displayed at once. More details can be found on our Repeater field documentation
New - ACF Blocks now have a versioning system allowing developers to opt in to new features
New - ACF Blocks now support version 2, enabling block.json support, reduced wrapper markup and significant other new features. Full details and examples of this can be found in What's new with ACF Blocks in ACF 6
New - ACF Blocks no longer use Block IDs saved in the block comment. See What's new with ACF Blocks in ACF 6 for more information.
Enhancement - Bulk actions for field groups now include "Activate" and "Deactivate" options
Fix - ACF will no longer perform a multisite database upgrade check on every admin load once each upgrade has been performed
Fix - ACF Blocks preloading now works for blocks saved in edit mode
Fix - ACF Blocks edit forms now behave correctly if they are not visible when loaded
Fix - ACF Blocks now always fire render_block_preview events when a block preview is displayed or redisplayed
Fix - ACF Blocks with no fields now display advisory text and are selectable in the block editor. This message is filterable with the acf/blocks/no_fields_assigned_message filter, providing both the message to be displayed and the block name it's being displayed against
Fix - Accordions inside ACF Blocks now match the current native block styling
Fix - ACF Blocks which contain no fields now preload correctly
Fix - Changes to an ACF Block's context now trigger a re-render
Fix - A rare warning inside wp_post_revision_field will no longer be possible
Fix - The field “move” option now no longer displays for fields when only one field group exists
Fix - Language for field group activation state now standardized to "active" and "inactive"
Fix - SVGs containing foreignObject tags now correctly render in JSX rendered ACF Blocks
Fix - Server errors during ACF updates or version checks are now cached for 5 minutes rather than 24 hours
Accessibility - The new ACF UI has significantly improved accessibility for screen readers and alternative input options
i18n - All strings inside ACF are now translatable
i18n - Accented term names in taxonomy fields are no longer corrupted at output
i18n - ACF translations are now synced with contributions from translation.wordpress.org at each release, increasing ACF's supported languages and updating many other translations. PRO strings should still be submitted as pull requests on GitHub (Additional thanks to maximebj, emreerkan and Timothée Moulin for their contributions which are included here)

Security Fix - Inputs for basic file uploads are now nonced to prevent an issue which could allow arbitrary file uploads to forms with ACF fields (Thanks to James Golovich from Pritect, Inc.)