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. 

Result:

Acknowledge link button is enabled. Yuo can press on it and opens popup, where you can't do anything. 

Expected: 

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.