Not a big deal now I've found this forum seems to work better in Chrome, but when viewed in Safari, there is no right hand sidebar and so no "Start a new thread" button available.
Using Safari 12.0 on a Macbook Air.
I'm on an 11 inch MacBook Air from 2013, screen is 11.6-inch (1366 x 768). Using Safari Version 12.0.1 (13606.2.104.1.2)
Not a big issue for me now I know to fire up Chrome if I want to post a new thread.
For what it is worth, I'm using Safari Version 12.0 (14606.1.36.1.9), and can see the 'Start a new thread' button as long as I am not viewing the ''Latest in Forums' page. The button is always missing when viewing that page (both safari and chrome), but it is present if I am viewing a thread, or if I navigate to a particular forum.
edit. for caparison, my display is 15.4-inch (2880 x 1800)
This post has been edited by the author on 1 November 2018 at 10:46.