Bug: line ending parentheses around URLs
Obviously, it's not surprising that the redesign didn't fix it, but IIRC, this problem even persisted through an architecture change.
Basically, line-ending parens around URLs with no trailing space get wrapped to the next line (so, for example, http://example.com)
(I left a trailing space there) is rendered as
(so, for example, http://example.com
You can see some similar artifacts at:
I think there were some additional problems with line-ending parens which do now seem to be fixed.
This problem and similar problems have existed for quite some time; see, e.g., these threads: