Your user rating probably fell below a 4. The board is set up to only display member rankings that are 4/5.
Since you are seeing "Rate Member" instead of Stars, it means that you either haven't been rated or your rating fell below the threshold.
Since you state that you had been rated before, I would guess the second.
Check your score in your profile. If it is indeed below 4, then you better start kissing up to a lot of folks
-Tacks