I am also facing the same issues, it because of "station expired" if your speed under 15 to 18kb/second you get error, let try "basic HTML" error does not come.
i also experience that, but after a day it came back. it is perfectly working fine. if incase it is still not working, try to contact their technical representatives.
may be you have some problem with your net connections. i am using gmail from past 5 years and i dont face even a single problem