I always test everything before I release it, as well as have a few other people confirm it. I know I go through more testing than most, but it seems to me as if they don't even do a single test run before uploading their revision.
That's certainly good, but sometimes you just can't test everything.
crediar either owns a EUR or USA console and probably does his tests through SNEEK and not via neogamma/wiiflow.
He can only test so much, what if all games work for him? But now here everyone has random problems for example yours was the dmcache.bin that broke everything but once deleted the games worked fine (also using a movie DVD? don't you own any games?)
People here also don't help much with their "doesn't work", post logs, your region, game region, 1:1 dump or compressed, ... !
The more details the better, saying doesn't work helps no one.
Also so many people have different video stuff configurations doubt crediar owns all three cables to test every situation possible.
That's why basically EVERY loader has a video config, DML is currently just guessing the best setting.