re: those skips i was fighting with....
it does seem to be a directory issue after all, and i'm not sure why what i did fixed it anymore. i just tried to move the entire project to a different directory, and the skips came back. undoing the process (through the menu) fixed it, thankfully. i have a hunch just copying it back wouldn't have.
after going through all the checks i did, i have to conclude it's a problem with the cubase software. this is an old version - sx 3, from late 2005. i couldn't imagine it not getting fixed. but i don't really know what it's doing that would cause this.
i've learned the lesson, though - don't change the directory.
of course, that's not at all feasible to actually hold to. i have to copy to create alternate mixes. i'm also going to want to back these files up when i'm done. i'll have to experiment with this to see what happens and ways to fix it other than re-rendering the freeze tracks.