Ah Ok. Multiple CR/LF do not seem to do anything. I think it could be an issue with Chromium rather than linux, but I am not going to be using my PC for a while now anyway as I am out for the weekend. So in the meantime I am on my work laptop...
And I can do new lines!
Guess, mac could count. But also, like Adze said... perhaps it's not a linux issue and I think he's more than likely right. I think it's possibly my browser. However I have tried it in epiphany browser too. Not firefox yet, but I will do. I have just found recently that I have not been getting a long with fire fox very well
I was hoping I could find secret vBulletin newline/carriage return characters but there doesn't appear to be any. Not so worried about the wysiwyg as vBulletin code isn't difficult... but writing posts consisting of one big block of text is rubbish!