The pulsating green progress bar sometimes turns yellow in Windows 7. It happens in multiple apps and programs, but I can't tell the exact conditions under which it occurs.
Does it mean anything or is it a glitch?
This is not a bug/glitch, it is a feature:
Green means in progress
Red means stopped due to error - Needs user intervention
Blue means paused (although never got to one of these)
Yellow for either paused or hanged.