I marshalled at braddan oak tree, the only problem we had was two fell of chairs on to the track.
The main problem we had was people wearing BRIGHT RED COATS, BRIGHT GREEN COATS, AND BRIGHT YELLOW COATS, right in the line of sight of the riders, one or two riders that stopped with us passed comment on the wearing of these colours. We went to a lot of these people who didn't realise that it was a distraction to the riders, but all the people we asked were very apologetic and removed the garments.