Can't sign in - Unknown Error 400

For the last few days I've been unable to sign in. I get the following message:
"We could not complete your Music Store request. An unknown error occurred (400).
There was an error in the music store. Please try again later."
Disturbingly, if I use the "Forgot Password?" button, Safari displays the following page:
"Server Error
Bad Request Error
This error indicates that an invalid request was received."
Something very screwy is going on!
I am using iTunes v6.02 under Mac OS X 10.4.4. I've reinstalled iTunes, switched off my firewall, checked my routers firewall.
I have no problems using any other internet services: http, https (since iTunes uses these ports).
Any help greatly appreciated!

Well what do you know - it works now! :-D
I must have done something wrong the last time I removed the cookies. The only thing I did differently this time was quitting Safari before starting up iTunes. But after cookie removal the darn thing suddenly lets me sign in again.
But I wonder why cookie problems suddenly turn up out of the blue after many blissful months of iTMS? Perhaps a case of a corrupt cookie? Maybe whatever Apple thought they fixed in iTunes 4.9 has reared its ugly head again in 6.02!
Thanks for your assistance guys, greatly appreciated! (^_^)

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