Capo...affect intonation?

[lowlandtrees]

I suspect my MM SUB needs a set up but would putting a capo on first or second fret throw out intonation? I play in a couple/3 of bands and one of them down-tunes a semi tone. We play one night then the following night the other band then two days later the other band etc...so being a lazy bugger I just use a capo...not to gig ...just practice...but I have discovered that with the capo on, intonation is affected....or could I possibly need a set up?

[Hellzero]

Indeed, you need a setup involving the nut height adjustment as it's the culprit in this case as without a capo the intonation is fine. Go see a true luthier.