I made a Topic in the Bug Report section of the forums you all should take a look at and read as all of you should know Awareness Nullify s the chances of sustaining critical damage for 25 Seconds.

After many hours of testing with multiple healers Awareness does not only stop critical damage but also prevents the paladins from getting critical heals for the 25 seconds awareness is up.
I personally tested it with a whitemage and a sch.
The Sch having higher crit chance then the White-mage.

The SCH Could not crit me for 25 seconds at all but could crit me with-in 25 seconds multiple times when Awareness was not up.

The WhiteMage has a Spell that can proc to grantee Crit with cure III With awareness up it does not crit the paladin what so ever.
Again please test this for your self and make a post on the In Game bug sections of the forums.

Swordthane
Ethereal Knights
Adamantoise