Thanks for getting back to me.
Putting the mouse pointer over the speed nothing change. If I roll the mouse wheel forward or backward my view zooms either in or out.
I don't get the tool tip come up if I hoover the mouse over the IAS.
I can change ALT and VS fine.. just the speed.
Can it have something to do with using the mouse to zoom in and out in the cockpit?
If so I don't understand why the ALT and VS will let me roll the mouse wheel without issue...

I'll make a double check on this later. I'm just heading out so don't have the time right now. I'm pretty sure what I have described here is what is happening....