Figured it out, I think. Some quirkiness regarding fps setting in assemble room vs. fps setting in preferences. My fps in preferences was set at 24 by default. I didnt much care since I just changed it to 30 whenever I opened an animation in the assemble room. However, changing it to 30 in the assemble room wasnt getting the job done. A little more experimentation showed that if I rendered 35 frames (of the 30 frame walk cycle) Id get a smooth loop, which should not be the case since the loop should start again at frame 31. Yes, I tried setting the frame count to 30 for the first set of tests, which didnt solve the problem, so I did another set of tests accepting the 120 frames that Carrara created on import of the 30 frame animation. Same result either way. Then, running out of things to test, I decided to try changing the default fps in preferences to 30. That seems to fix the problem. Apparently just changing fps in the assemble room isnt scaling the keys properly. Long story short: it looks like we need to make sure to have the fps we want to work with set in preferences and not rely on changing it in the assemble room. Ill do a few more tests soon to confirm that. Gotta go scrape the glaze off my eyes first ;)