Yep, I have that problem too. It is a little different from what you hear in FL. Also, Fl is still slow ass shit and slows down horribly, even when its supposed to to "a lot faster" because of the new hyperthreading technology(gotta e4400 c2d, not that great but supports hyperthreading). As for artifacts, no I don't get any when I render out.

It's not really an artifact, but mostly a sound, for example hat or crash, sounding a bit thinner than in the DAW itself. What's the proble? I think i need to switch to ABleton.

Why if I change interpolation to maximum quality(512-point sync), i can hear some strange thin sounds (usually during a reverbed sound or hat) while if i leave it at linear, the rendered audio sounds almost like before rendering? Damn my head gonna explode.