We're running version 3.9.15526.0 of Adaxes, and in the Web Interface when you try to edit the logon hours for the user, you can not select hours 9 and 10 individually.
In the example below I wanted to edit hours 8,9,10, and 11 on Tuesday to be denied. When you try to click on the 9 and 10 it doesn't work, the icon doesn't change.
Here's a screenshot of one when the icon flips to the finger icon. when it's working.
You can select Tuesday, or select 9 or 10 at the top, and that does work.
I confirmed that it doesn't work in either Chrome or IE.