Steps to reproduce:
1) Disable "manual close" option for trigger.
2) Disable actions for role - "Acknowledge problems", "Change severity", "Add problem comments".
3) Leave action "Close problems" enabled.
4) Create problem (trigger with disabled manual close).
5) Go to monitoring->Problems.
Acknowledge link button is enabled. Yuo can press on it and opens popup, where you can't do anything.
Ack link button is disabled.
There is several places where need to change this.
1) In widgets.
2) Monitoring->Problems page.
3) With link/URL
Also, need to check that Ack link button becomes active, after pages auto refresh.