Hmmm, can we have instructions on how to post images to this forum, please? [Other forums have instructed ON THE PAGE where you are actually posting - can we see this on this forum, please]. Also, can we have a PREVIEW of the post on this forum please, which will also avoid problems like this? (When I select 'Preview' in "Advanced Mode" I get 'Preview is currently disabled.')
Here's my second try:
Here's my Dock as it's SUPPOSED to look:

Here's what the Dock looks like when I (re)start the Desktop Window Manger Session Manager Service:

The above screenshots were taken with the Dock set to 'Keep on Top' so that it is actually showing when I restart the service. When I set it to 'Hide off-screen when not in use' so that the Dock is not actually showing when I restart the service, I still get artifacts showing (even though the Dock itself is not supposed to be visible) but they are much more subtle and slight.
Again, anyone else get this?