maybe some css got rewritten. Someone, or maybe I will, make some posts at the official joomla forums to see if anyone has an idea.
www.kunena.org/
New version of kunena, which you know is what the bbcode forum runs on, came out recently. It was a stability build and fixed a bunch of bugs. I think the space issue was one of them.
It also might be an issue with the css handling line compressing strangely.
www.kunena.org/forum/137-k-15-templates-...-with-my-forum#79961
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seems like this guy has the answers
.
"Your problem is your site template ../templates/jarutile/css/template.css at line 140:
Remove the following four lines from that file:
br {
font-size: 1px;
height: 1px;
}
This is not a Kunena problem. Cheers. "
.
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Those are the two fixes I found. granted the above isn't the direct fix, this sites template is different than the example site, but you most likely need to find something similar in the css.