If you have rich text where the first line break has additional line breaks in succession, only the first break displays.
Looking at the HTML in firebug, the first line break or set of line breaks are rendered by wrapping all of the content after the break in a
tag. After that first set of breaks, all other breaks are rendered as a
tag for each break, no matter how many in succession, and they display fine.
For example, if I add 4 line breaks after each of 4 paragraphs, the first set of breaks display as a single break with no space between the first paragraph and the next line while the others render fine.
The text:
a
b
c
is being rendered as:
a
b
c
the HTML rendered is (via firebug):
a
b
c