Admin pages don't open

Last night I upgaded from 1.7 to 1.8. I log in to Admin console and every menu item I click on produces 'Access denied'
'You do not have permission to perform the selected operation.'
Please help
Thanks
Igor

Have you checked files & folder permission required for ASP.NET?
Usually it's Network Service & IIS guest user configured for the website.

I did, permissions are ok. I think that this has to do with 'NopXXXXManagerSqlProvider'
If I open Web Site Administration Tool from VS 2010 and set the provide to NopRoleManagerSqlProvider and NopMembershipSqlProvider then click on Security I get this message 'There is a problem with your selected data store. This can be caused by an invalid server name or credentials, or by insufficient permission. It can also be caused by the role manager feature not being enabled. Click the button below to be redirected to a page where you can choose a new data store.
The following message may help in diagnosing the problem: The method or operation is not implemented. '

and a button 'Chouse Data Store' if I click the button it brings me back to providers.
Any ideas?

I'm almost sure that you enabled ACL but have not configured it. Go to Admin area > Configuration > Access control list and ensure that 'Access control list enabled' is disabled.

If you cannot navigate to this page and still getting this warning, then execute the following SQL command over your database

UPDATE Nop_Setting
SET [value]=N'false'
WHERE [name]=N'ACL.Enabled'

, then restart your application and try to visit your admin area one more time

Done - no effect.

does anyone talk english on this site!? i'm having the same problem i cant access ANYTHING i can get on my control panel just fine but everything i try just say you do not have permission...need someone to talk english please

Just wanted to post my experience in case it happens to anyone else and figured someone might come across this if searching for "You do not have permission to perform the selected operation."  Last night I generated my machine keys from IIS, changed my password, made a few changes to pages and everything went smoothly.  Then I went to the Security settings tab to setup re-captcha.  When I clicked save I received a message that the settings had saved but that I didn't have permission to do that.  I spent 3 hrs trying to figure out what was wrong, no ACL issue, setup as admin, able to login/out, DB good, cleared cache, restarted app...nothing...finally gave up and went to bed.  This morning, I login and....no problems...full access again!  It saved the first part of the recaptcha I entered last night, but not the 2nd key. I entered the 2nd key this morning, saved and no problems.  VERY WEIRD! I'm running 3.3 source.

Also want to say thanks to the nop team and community for the great cart and all their hard work!