Last plesk update - Lots of problems...

[albans]

Grrrrrr... I updated to Plesk 8 last week. I had lots of problem but it was stable for 4 days...

And today, I saw that there was new updates for Plesk8... So, I installed them. And now, I cannot access the Plesk Admin website. It shows this message:
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ERROR: PleskException
Unable initialize admin session:

0: /usr/local/psa/admin/plib/cmd_loginup.php:190
createSessionCommon(integer '1', string 'admin', boolean true, boolean false)
1: /usr/local/psa/admin/plib/cmd_loginup.php:262
createSessionAdmin(string 'admin', string '*************', boolean false)
2: /usr/local/psa/admin/plib/cmd_loginup.php:128
createSession(string 'admin', string '*************')
3: /usr/local/psa/admin/htdocs/login_up.php3:21
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Why?! I really have the feeling of testing a beta software...