strange behaviour : grep -i --colour ""

[martinko]

hello,

i've just found out that while 'grep -i ""' and 'grep --colour ""' 
behave as expected (by myself), running 'grep -i --colour ""' results in 
very strange behaviour - grep consumes all available cpu and, based on 
its input and terminal type, its output is definitely not what it should be.

is this a known issue pls (i couldn't find anything about it) or am i 
just missing something ?

regards,

martin

ps: observed on freebsd 5.3r-p5