If one writes a comment with paragraphs in a story in the Idle section, the paragraphs do not show up in the Preview properly (one blank line between them); there is only one carriage return no matter how many blank lines are requested.
Does not seem to depend on which mode you compose in (HTML, Plain Old Text, etc.) and only is a problem in the Idle section, where the comment rules are different I guess.
I encountered this, but not in the idle section. I replied to a normal Slashdot story comment thread. Correct me if I'm wrong, but therefore it wasn't in the beta.
this
example
Turns (in preview) into:
This
example
I am now seeing this happen in regular stories as well - I have not tried it on an Idle story since filing the report as I don't normally look at Idle stories, so I don't know if it still happens there.