this is a random occurring issue and as everyone I talked to has no real clue on what is going on I'll try to explain it:
I added NicEdit to my Wordpress Blog (as did a few of my friends) and every now and then the line breaks are not submitted.
One comment shows up like you styled it with breaks before hitting submit, the next won't.
I'm not sure, but I'd guess that one of ten comments has this issue. It has nothing to do with the browser being used as it is really random on when it happens.
