Did you leave "Recorded Tivo suggestions" turned on?

Yes, I believe so. It still records suggestions for me as far as I can tell.

Is there free space on the drive? Tivo won't record a Suggestion if there is no space, priority goes to the stuff you recorded.

Depends on your definition of free space. There are a bunch of existing recorded Tivo Suggestions still there, stuff that I haven't watched nor deleted. Stuff that I didn't specifically ask it to record nor did I thumbs-up it. I would think it'd tend to get rid of those in favor of things I specifically thumbed.