Created attachment 8826249 [details] Screenshot from 2017-01-12 09-33-37.png Reviewboard has always been a bit wonky on my desktop machine, with the action bar showing an ellipsis drop-down menu despite there being plenty of room for all the options. But it degraded significantly recently, showing no sidebars at all, with everything in uneven-width centered elements. See the attached screenshot for an example. I think the CSS is confused by the screen size or resolution and using mobile styles on desktop. This example is with the browser maximized on a 27" UHD display.
this has been fixed in bug 1329686 (however it hasn't yet been deployed to production -- soon)
Thanks, I'll look forward to the fix then.