"We've detected a problem next to your browser cache."?
Answer:
This can start in Windows XP too. I fixed it by going into Norton Internet Security and unchecking the lines labeled "Block popups on this site" and "Block ad on this site", when I got the "We've detected a problem..." message. I guess Yahoo won't permit you use the 'free' mail service if their sponsors are blocked out (their compensated mail service have no ads).
Try clearing it out.
http://www.centennial.k12.mn.us/clearbro...
In Firefox, download & install IE Tab from https://addons.mozilla.org/en-us/firefox...
goto Tools->Extensions and add http://us.f567.post.yahoo.com/
This allows Firefox top open a tab contained by IE mode and it works.
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