In such case, if you check the history, do you see some redirection page between IMCDb and the final "winner..." page ?
I could then try to report at least that (or in worse case, the final page)

Until now it was just Sovrn for registered users, and Sovrn+PubGalaxy for unregistered users.
For testing, I've switched the provider for registered users, using just PubGalaxy, see if that prevents problems (and in case any occur, they are maybe easier to report there).