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You will probably find that the grinder is bunged up with grounds. This can happen if there is a bit too much steam inside the housings. The grounds bind together and will not drop with gravity. Pull the grinder apart, clean it out then run it with the top housing off and see if you can observe any leaks/steam. There will be some steam, you are looking for excessive steam.
Are the beans very oily? Oily beans can sometimes cause things like this. My suggestion is you take out the bean hopper and clean the beans under that because on my Miele CVA4066 there are usually more than a few beans and chipped off pieces of beans under the hopper which cause some trouble.
Make sure the hopper is working correctly to see if there are any blockages, then check under the hopper to the opening where the beans go to the grinder. My guess is that there are a few beans and chipped portions of beans which are clogged under there.
There is set-screw that holds the cofee bean container from pulling all the way out. Loosening almost all the way out (or removing) the screw, will allow the cofee bean container to slide all the way out. However, when sliding it out, put a container under the edge of the machine housing to catch any residual beans and keep them from falling all over the floor. Here's how to do it: with the door open, look (or feel with your fingers) directly at the (closed) coffee bean container. Coming up from the bottom, all the way on the right side is the set screw. It's a black phillips screw that you can easily miss if you don't look carefully or use a flashlight as it blends in with the housing. Good luck.
The screens that the coffee grinds are squeezed in between are clogged. You need to remove the brew unit, remove the bottom screen, (should be one phillips screw in the center) and scrub the screens clean. You need to clean all of the really fine holes out so that the water can pass through. To prevent this in the future, use the rinse cycle on the machine frequently and also take the brew unit out and rinse it under hot water everytime you dump your waste unit.
You have a blockage that needs clearing. try putting on full rinse cycle a couple of times, but if that doesn't work then I'm afraid that you will need to call Miele to repair as it is a bit tricky to clear. Also sounds like you may have used a "coated" coffee bean. These machines can only use a normal bean & not flavoured beans which have a coating (sticky). If you have been using the normal beans only then the rinse may help.