I keep on getting clogged washer arms in my dishwasher. I have replaced the accmulator-filter as the filter screen was torn, repeatedly cleaned & cleared the all washer arms, cleaned the water distribution system and have also replaced the water inlet valve (in case I was not getting enough water to run the machine). I also replaced the docking station grommets to make sure I have a tight seal. It seems like stuff is getting into the water distribution system that should not be there in the first place. The machine seems to be draining okay -- I notice just a little water in the bottom after the cycle, but the manual says that's normal. I just inspected the accmulator-filter and the filter screen is intact.

Where would you look next?

Thanks.
HDA

Thank you for the ideas.
I will look again, but I think the chopper blade does not turn on the shaft as I was looking at it earlier this afternoon, and shaft is a hexagon. It does not look too expensive, I may just replace both the blade and shaft anyway (process of elimination) and see what happens. Could this situation be caused by a weak drain pump that leaves too much dirty water behind for the rinse cycle?

Great ideas. Thanks.