1. For some reason, this does it to me too, but probably because I have the files on a jump drive... Anyway, you just have to save another replay after those new ones. Either that, or you just have to wait and it will work eventually.
2. If you know the exact name of a mod (with .tbm extension and all) you type /lm <mod name here>.tbm and then reset the game. (Not close the window, just press Escape and click Free Play again.)
3. I remember this one... Unless I'm mistaken, it's extend the pecs, contract elbows, relax wrists, and at least one grab. That's at least the simplest form, there's a whole bunch of versions of that move.