The Value field of Debug attribute is sometimes not editable. It's happening mainly after the first login to Hawtio. I didn't find out the pattern when the field is editable and when not, it's just random for me. Sometimes it happens also when I click on other pages and then go back to check the field.
It's not a major issue for user, he can just close the window and then open it and the field is editable. However, it is very problematic for our automated tests.