@Switch Blayde
Right now you cannot have two lines without a blank line between them. That's new.
That's not caused by change in the forum's code. As I said, I haven't changed the forum's code in quite a while.
However, a change in browser behaviour may cause something like this.
It's technical, but different platforms handle line break encoding differently.
Windows uses a new-line+carriage-return characters in tandem for every new line.
Unix uses a new line only.
Before Mac OS X, the Mac used a carriage return only, after OS X it switched to new line as it's a unix system.
Strangely, on the Mac, Safari converts new line characters to the windows convention of New-Line+Carriage-return.
So doing < br> tags is somewhat tricky.
I didn't change how this is handled, but maybe some underlying library on the server changed that behaviour or the user's browser changed behaviour triggering new behaviour on the forum.