Me midi dont work

Hey all

i’ve got a Novation Remote SL
I love it, and it works fine with my laptop and my desktop.
it also works fine with a couple of other computers

however, on some computers, i can see it recognised in device manager but vvvv doesn’t enumerate it. i know this is a vague ‘i dunno’ type query, but does anyone have any ideas as to how to debug this, as all my performances live off it.