softlysoftly, I am afraid I don't have the answer.

What type of samples are your multi samples, giga, EXS, VSL, Soundfont, NKI, etc.? And whatever these are can they be converted by Kontakt Version 1 (your manual should indicate this)? If your multi samples are not native kontakt samples then conversion of such samples is far more complex then your so called one shot samples.

I used kontakt version 1 and now 2 and have no trouble loading multi samples. Kontakt along with GigaStudio are top of the line samplers. They are used by serious composers and screen writers.

Furthermore, East West Libraries come with a kontakt player, namely Kompakt. So if everything fails you could use this player.