Provider say, dont change anything. 5 min ago s9 is begin to work correct. I dont understand, what was wrong, and maybe it can repeat again.

I try Opera, Mozilla, IE 7. Attempt to administrate blog from different computers. Blog works on s9 about 2 years, and this problem appears only today. Today i upgraded blog from v1.2 to v1.3.1 - its not to help.
Yes, also on hosting running other applications, but problems never appears.
And i use ...

Excuse my english.

I have the same problem. After login->crete new post-> s9 return to login page whithout any errors. If i try to change some settings, s9 write (my translation from russian):

Your browser did not send a valid HTTP-Referrer. bla bla bla Cross Site Request Forgery (XSRF) bla bla ...