When clicking links that show up in many news stories on my MyYahoo page, I get the following:
Your browser sent a request that this server could not understand.
Size of a request header field exceeds server limit.
Cookie: B=a64eva95pbep3&b=4&d=MT_CzoVpYEKok6Wxn9eYnrePh7iVyZwLBswKhQ--&s=mi&i=5Nt7PZCgn.NWgaMdwxsf; YLS=v=1&
That issue can be caused by corrupted cookies.
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
"Remove Cookies" from sites causing problems: