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How many sites do you have in piwik, lots of them you visit?
You could try to clear your cookies to get in there again or , if possible, increase the maximum header size.
Thats probably this issue dev.piwik.org/trac/ticket/409 .
[quote=Thomas Seifert @ Jun 23 2010, 01:39 PM]How many sites do you have in piwik, lots of them you visit?
You could try to clear your cookies to get in there again or , if possible, increase the maximum header size.
Thats probably this issue dev.piwik.org/trac/ticket/409 .[/quote]
There are 36 sites and i visit all of them. Now, after i had cleared the cookies, it work without errors. Yes, it looks like the issue.