Hi when i log into "yahoo mail" i get *This* the only way i can view mail is "Yahoo! Mail Classic" i "disabled" my "online-armor" and used the windows xp firewall for 30secs and it worked ok so it must be my firewall but i dont no what to adjust to get it working.
If you have an add blocker enabled, Yahoo have implemented this to try and 'make' you put up with the adverts which have become very intrusive recently. I have AdBlock Plus enabled and i get the same as your screen shot.
If this is the case with AdBlock, you can disable it for Yahoo in the options.