Originally Posted by
tropitech
have you tried the wall joins tool? what are the wall end join conditions (allow/disallow) ?
i have seen many complaints about this and it could also be a display issue, not specific to added sweeps etc. and also regardless of end join conditions. people have reported weird behaviour too like reopening the file gives a cleaned join sometimes, and other times not.
zooming in and out apparently changes things too, suggesting it could be an on-screen display issue, not an actual file output issue. maybe try changing the wall types to a plain wall (no sweep) to see the results?
what happens when you print?
sorry this reply isnt much help, but be sure to post if you find a solution