i recently put in new strings, and i think they are all the same gauge as my previous set except the 5th and 6th which are a little heavier i think. anyway my bottom four strings all buzz at the nut when played open. sometimes, however, the buzzing goes away for a while but soon returns. the 6th string can get particularly bad.

could it be that the new strings are settling in and the buzzing will go away? or is it a deeper issue?
how would i go about tweaking the action?

oh and i purposely got them thicker on the bottom strings so i could tune them down and still have some tension :S
my guitar sometimes does the same. it isn't cause of your strings gauge, i find that it usually goes away after a few days.
ive just been playing for about ten minutes and its gone away. but im thinking it will probably return quite soon. thanks anyway