I have Portal running on IPB 4.1.18.2, seem to have a small bug. One post included a full-width line of underscores: in Portal view, that page did not resize to the browser width -- because the line of underscores did not get wrapped/broken. The width correctly resizes elsewhere in IPB (e.g., the Topic view).
We fixed the problem by deleting the line of underscores -- but to prevent a recurrence in any future posts, is something in the Portal CSS that isn't quite the same as on the rest of the board?