are you importing it to "audio" tracks, "audio instrument" tracks or "midi" tracks?
The way I import audio on my mac using Logic6 it to Shift+pencil icon on the "audio" track I want the sample to play on on. This prompts Logic to specifiy what sample file to import on the track.
Question. when you import the sample, and play it (without hearing it), do you see the signal bounce up and down on the Mixer Channel corresponding to that track? Can you play plugs (Logic's native synths) on the "audio instuments" track strips and here sound?
Lastly, why not use Rewire to play your reason instruments from Logic rather than bouncing everything down to audio? Do you have a slow computer?
Let us know.