RDi stopped tracking changed files

Went on vacation, came back, and RDi was no longer tracking changes. Meaning, when I change a source file, it no longer shows up in the "pending changes" view. So I can't check in my changes, nor deliver them.

I'd like to think this means I shouldn't return from vacation, my manager and customers has a different opinion.

I'm on 9.6.0.6 of RDi. This continues to work for my team member, who is on a slightly older version of RDi. I have other environments (different product version), also on 9.6.0.6, same RTC Jazz server and source control method. Based on this, I suspect there's something wonky about this one installation. Like I said, it was working a few weeks ago, and our team is so small that I don't think there would be any policy changes initiated on our ends. I may unwittingly have fat-fingered something, but I can't figure it out.

Any ideas?