I can’t get my “Excellent” vote to register on a couple of fotos… nothing serious, but I’d like to give my full thumbs-up to some excellent fotos! thanx!
Are you sure you didn’t already vote it 5/5?
You can change your vote as many times as you’d like.
It shows my vote as “Excellent” when I hover the cursor, but the bubble isn’t green… there are some really good fotos in Flight Aware that deserve an Excellent!
The colored bubbles show the average score, not your vote.
*“Slapping forehead vociferously” * 
Thanx…