A:Answer YES, it's because it's a non-vented washer. Many are these days apparently. And using it every day helps "clean it out " from what i see and have heard. Ours smells after a day off. IF you're stuck with it, try putting a small glass of vinegar in the tray Upright so the vinegar gets splashed out slowly and helps sanitize it. I tried that and it seems to help a bit, and white vinegar is cheap at least.
The filter smells even with a tiny bit of stuff in it too I think.