Actions Not Saving

I've created a set of actions for Alignment, set to my function keys. They worked great, but after shutting down and reopening Illustrator the next day the actions have partially cleared themselves. It's weird, they're still "there" but the core function disappears and I get a message that says the action is not available.

So I already re-created my action set when I took this screenshot, but the selected line item (Horizontal Align...) is the one that disappears each time. "Align Left > Alignment" stay put, though. I've never had actions behave like this before, any ideas?