Betfair and Internet Explorer

I have been using Betfair on I E for 6/7 years with very few problems and all was OK up to last Saturday "Grand National" then on Tuesday when I logged in avaiable funds will not load, Account Summery says Unavailable also other parts of the site will not work, I have deleted cookies & temporary internet files as stated in the help email sent but it is still the same, why has this suddenly happened since Saturday? also I do not want to use Firefox.

Has anyone else suffered this problem ?  [>o][>o]