Yes, definitely something going on here.
When I try to edit a post, before doing anything, I get these JS errors in /wp-content/plugins/acf-repeater/js/input.js:
[Error] TypeError: undefined is not a function (evaluating 'this.$el.find('> table > tbody').unbind('sortable').sortable')
init (input.js, line 51)
(anonymous function) (input.js, line 222)
each (load-scripts.php, line 2)
each (load-scripts.php, line 2)
(anonymous function) (input.js, line 220)
dispatch (load-scripts.php, line 3)
handle (load-scripts.php, line 3)
trigger (load-scripts.php, line 3)
trigger (load-scripts.php, line 8)
(anonymous function) (load-scripts.php, line 3)
each (load-scripts.php, line 2)
each (load-scripts.php, line 2)
trigger (load-scripts.php, line 3)
(anonymous function) (input.min.js, line 1)
Then, when I click the “Add image” button, I get these additional JS errors:
[Error] ReferenceError: Can't find variable: wp
popup (input.min.js, line 1)
(anonymous function) (input.min.js, line 1)
dispatch (load-scripts.php, line 3)
handle (load-scripts.php, line 3)
Strangely, I only have these issues when logged in as a WP Editor. Everything seems fine when logged in as a WP Admin.
Perhaps this is caused by the recent WP 4.1.1 update?