I wonder if anyone else's site has started showing this anomaly?
It only started in recent times, perhaps after some recent updates?
It doesn't warrant priority of the support team at the moment but if others have it, it may help diagnose the issue.
You could also see if it happens on your computer and let us know.
www.lancashire-ramblers.org.uk
My main menu has a number of menus leading to a hierarchy of submenus.  (e.g. "Technology" on my site)
If one of these is on the far right of the screen, the first level of menu shows, but may not show the little > sign indicating a further sub menu. If one tries to access that next level of menu, it does Not show -  unless one manually scrolls the screen to the right with the cursor keys to expose it.
Normally would expect it to show on the left so it is within visible screen.
Even zooming out/in has no effect, if a hierarchy menu is at far right it will not display properly. Looks as if it's lost the sub menus.
Didn't immediately show up on Chris's computer until subsequently looking at it.
Thanks Eric