Either your account is bugged somehow or you really need to learn to play. No offense, but i generally get gold level contributions for just simply walking through the area of a DE or killing 1 to 2 mobs at a DE. How you are getting zero contribution or just bronze or silver while you're there the WHOLE time and actively doing stuff sounds like you are either experiencing a major bug or you are greatly exaggerating. I can't even remember the last time I got anything less than gold level participation for a DE, and alot of times I am simply passing through the area while a DE is going on. So yeah....you might want to get that checked out.