Guild Wars 2

I have been using the middle mouse button to enable autorun since forever but today it stopped working.

When I tried to remap it by deleting it and re-allocating the button in settings the game failed to recognise the middle mouse button. It would “see” every other button on my Razer mouse except the middle scroll wheel clickie.

Any idea what is up with this or am I going to have to get used to an entirely different key after over 15 years of online gaming?

Anyone else unable to map the middle mouse button as a hot key after the patches?