http://bugs.winehq.org/show_bug.cgi?id=20466
--- Comment #12 from Vincent Povirk madewokherd@gmail.com 2010-06-12 17:15:53 --- It seems like the important part of the log is garbled because another thread was writing at the same time.
You should be able to prevent that by appending to a file rather than redirecting normally, like this:
WINEDEBUG=+seh,+tid,+relay wine program.exe >> relay-log.txt 2>&1
Somehow I don't have much hope that it would show anything interesting, but I can't be sure.