Still playing around but I have newlines working here if I changed the Forum Skin to the Default Mobile Skin.
Unfortunately the skin doesn't completely display properly and the forum is not as nice looking as the Surface V1 skin that is the default.
Not sure if there is any other setting that could be effecting it outside of the forum skin.
Just seems like something is off in the forum setup, since the Surface V1 skin doesn't recognize the newline from the enter key. Just doesn't do anything, but if I switch to the mobile skin the enter key moves to a new line. Hopefully they can address it, whisk will make it easier to post more complicated things.