Haven't had that problem.
On my desktop machine, Shift & Middle Mouse Button gives Zoom ... MMB scroll is also Zoom and is what I use.
Ctrl & MMB is Pan.
Alt & MMB is Rotate
Hold MMB and drag gives Spin
You are correct, That should have been "Zoom Mode" (my mistake). I'm not sure what it is but I am pretty certain its not a stuck key on my keyboard.
might be related to "filter keys" or "sticky keys"... not sure exactly, but that's the first thing that came to mind when I read your post. I guess something to double check.
How does it work when you unhook the laptop from the docking station and use just the laptop screen or the laptop screen and one monitor.
I am guessing it is a docking station issue.
Thanks for the input and you might be unto something there. I have a similar docking station at home and I never encounter this problem at home. I forgot to mention that at work, (where I see this problem), my docking station is also hooked up to a KLM switch box because I am sharing the same keyboard and mouse with my Unix Box which is used for accessing SDRC legacy data.