Welcome to the idiosyncrasies of Mach Turn
Go back to an earlier version to solve the toolpath way off screen issue, can't recall when it started though but I know it was before the tool DRO that shows offset and tool number and that is the only reason I put up with having to scroll at times.
Two other things I would do, first is as you are using the rear toolpath view I would change the tools in the table to Rear. Also if you disable view lathe object (or something like that) it will help with a lot of the viewing issues, it should be, from memory, on the Toolpath page from Config button..