When I had Joomla 1.5.26, I used the JHacker Watch free with Admin Tols free edition. Everything seemed to work flawlessly.
After I migrated to Joomla 3, I installed Admin tools pro and JHacker (free). My site became locked. I had to completely remove JHacker to continue working.
The test was done beginning of August 2014, with the latest (at that time) Joomla, Admin tools pro and JHacker. It is not easy to retest it, since the site is in production now.
Are you aware of this issue? I'd like to be able to use JHacker again.