1.7.3 Zeds are not attracted by grenade explosions

[Alphie(SN) 32]

Date/Time: 7/15/2012 9:15PM EST

What happened: I accidentally threw a grenade with zombies less than 30 meters away and they did not aggro to explosion

Where you were: Hunting stand

What you were doing: Cycling thru weapons when I accidentally pressed F when I had a frag equipped

*Current installed version: 1.7.2.3

*Server(s) you were on: US283

*Your system specs: AMD Phenom II x3, 4GB DDR, 1TB HDD, Nvidia 8800GT

*Timeline of events before/after error: Approached hunting stand to loot, saw 3 military zombies walking away, accidentally released a frag grenade. Explosions did not aggro the three military zombies who were 30 meters away or less. Explosion was louder than anything else I have experienced in the game. Much louder than a tin can, but it did not aggro the zombies. They kept walking down the hill as if nothing happened. I glad they didn't because I would have been dead meat, but it is not expected in the game and breaks immersion.