I'm not having any problems with the captchas. Most of the one I see are ad related and show up in easy to read words that make sense.
I do recall getting hard to read captchas a while back. I did as skippy suggested, just kept clicking refresh until I got something that I thought I could read -- if it worked, fine, if not -- refreshed again (and again). Eventually, the captchas ran through whatever their list was and I started getting captchas I could read.