repeated yellow squares drawn under mobs

I accidentally did /bug three times, and the report id's were 4,041,033,251 & 3,376,240,741, & 48,507,851
[IMG]http://i61.tinypic.com/2lvmqhi.png[/IMG]
[IMG]http://i62.tinypic.com/30jkz2d.png[/IMG]
my graphics card is an nvidia, I am running windows 7.

have you tried running the pack check (as admin)?

There is a second report of some other graphical glitch and it's on the drop bears(seems the same with you)