Using Firefox 16.0.2 22 on Windows 8, I've had a hard time reading certain sentences. Browser is normal zoom.
clean looks like dean.
click looks like dick.
Screenshot if you cannot see it:
And generally a lot of letters are too close (close, not dose, hehe).
Like ct in 'exactly' in my screenshot, and ce.
Edit: This happens in Chrome as well. But not IE. Edit2: Added click example, as I've seen this some times lately..