Will try to make a video of it, although it will only show the change of colour, nothing else seem to change.
I know you don't live in Belgium, but one spot I am certain of is when I switch from the A12 to the R0 around Brussels (Belgium). Although I have seen it on lots of other intersections too, this is one I take almost every day. This junction around Brussels is a clover-leaf interchange (a 4-way interchange in which inner loops are provided for left turn movements and direct outer connections for right turn movements). As soon as I get onto the interchange, technically I am no longer on a motorway. Perhaps that is the reason the software treats this differently.
As for the other quirk: do you have any idea as to why the traffic signs revert back to US when I switch on Large signposts?
Weo
You are having really odd issues. Are you sure you cleared your save files out when you updated?