That's odd,besides not seeing the green going across the progress bar and the running botcheck at the bottom,your pause button didn't appear.
I tried a bunch of different settings,and I cannot make Spybot stick like that.
The only thing I can think of is to try running a scan in safe mode,and see if the same thing happens or not.
http://www.computerhope.com/issues/chsafe.htm
(I'm crossing my fingers and hoping spybotSandra has some suggestions,lol.)