The 3NT was gambling and after finding out that partner had diamonds, west took a long time to think before passing 4D. North passed out 4D then called me after the play to complain that west clearly didn't have anything to think about and the long pause had put him off protecting (with a takeout double), which would have lead to 4H, followed probably by 5D, doubled off one instead of 4D making. It's an open congress, about two thirds of the way up, but only the first swissed round, so not particularly representative. North has played internationally, east/west are a scratch partnership and definitely not as experienced, west claims he was thinking about whether to bid 5D.
Opinions? This ruling ended up going to appeal as well.
Matt