Some minutes ago, Hardened mode prevent taskmgr.exe to run on my real system. From the second time I try to run it, it run normally without warnings.
Similar behaviour occured some days ago when office 2013 sp1 was installed and I tried to launch office apps to see if all was ok. Avast again blocked them for one time, but from the second time all was ok.
I think Hardened mode, especially in aggresive mode, is not usable at the moment. Some say that moderate setting is more problematic but I see that both of them can cause problems.
This message may be a bit offtopic but I want to show you that something goes wrong with Hardened mode.