Cent browser horizontal scrolling is not working

[SpringsTS]

On my browser I've 3 ways to do horizontal scrolling:

• With horizontal wheel (I've a 4-directions wheel on my mouse)
  
• Using Left and Right key, if no text field is selected
  
• Pressing Shift while scrolling, which converts vertical scroll into horizontal scroll
  (a behavior more and more common I've the impression)
  

The three are working for me.
Maybe an extension problem?