Unable to use mouse to set Associated Service Point for Fee/Fine Owner

Summary
I am no longer able to assign an Associated Service Point to a Fee/Fine Owner, which means that overdue fines processing cannot be tested.

Steps
1. Open Settings>Users>Fee/Fine: Owners.
2. Add a new Fee/Fine Owner or edit an existing Fee/Fine Owner.
3. Click on drop-down arrow for the Associated Service Points box for the Fee/Fine Owner to (if none appear, remove one from another Fee/Fine Owner).
4. Select a service point to add for the Fee/Fine Owner.

Expected result
Selected service point is associated with the Fee/Fine Owner.

Actual result
Clicking on service point within drop-down is ignored.

Additional notes
This no longer works on SNAPSHOT either.