I'm having a little problem with the canvas guidelines, that map changes between the two sides.
See the attached for an example. This shows a diff on line 70, but the guidelines are misaligned an are showing around line 76/77 instead.
Scrolling the editors makes no difference -- the guidelines are always misaligned by the same amount.
The only thing that seems to rectify it is toggling line-wrapping off and on again. (Whilst line-wrapping is toggled off, there are NO guidelines drawn in the canvas, which also seems a little odd.)
Any ideas? I'm 85% sure this was working just fine earlier, so it's almost certainly something I've broken when messing around with CSS elsewhere on my page.