Maybe, when you were browsing google under maintenance.. I ever got experienced about that.., other case maybe your browser or you computer has infected by a virus or mallware... Check it!
plz give us more info abt ur problems more specfic, u just make me feel nervous could it be the web browser's trouble ??
I've yet to see an error like that when working with google in which I do all the time. Which browser are you using and what add0ns are you running?
The links in the search results are a different colour of blue sometimes as well, a much brighter blue but only on some Googles. Also Ive seen the results indented with a wide margin on the left. I should take screenshots of these things Im seeing this stuff regularly. I think Google is experimenting with things and its not my browser. If it was a browser thing Id see this stuff all the time.
I'm not dealing with any problem regarding on GOOGLE here, except for the capcha code. Maybe there is just a certain error with your PC or Gogle is having a little maintenance on your place. It will all come back to normal with just a few minutes