I have this same issue, only for me it's the upper-right corner, not the upper-left. I can break the endless scrolling by pressing Esc, which opens the game menu, and then clicking on Resume Game. I have a Logitech G500 with the latest drivers.
I have had that only on smaller maps oddly enough, and ya, those were easy to break by simply moving the mouse around in circles a few times for me, the top left one though seems to be the stubborn one.
Also still waiting for a response or atleast acknowledgement from a dev or person in charge, i'm not letting this go or giving up easily this time (i did this rant awhile back not long after first DW game launched)... i want to be able to play and enjoy this game, i simply love it's mechanics and gameplay but this bug makes it unplayable, which really sucks.
< Message edited by Carl4243 -- 5/30/2011 5:55:34 AM >