I definitely have all the correct permissions set everywhere. I've tried unsetting and re-setting them. After several minutes of just opening snippets, changing them and re-saving them, suddenly the autoexpand is mostly working. Sometimes keywords expand, other times they don't. I have no idea what the rhyme or reason behind it is, though I have a vague feeling that the intermittent nature of the expansions may have something to do with some of my snippets being set to autoexpand and others not.