Wordpress Login: You do not have sufficient permissions to access this page

After installing Wordpress using Importbuddy.php (part of BackupBuddy from iThemes), the site appears correctly with theme, plugins, and content. However, when I login as administrator, the login is successful (http://www.allstarboating.com/p/wp-admin/profile.php), but the page displays this text:

You do not have sufficient permissions to access this page.

Actions I've tried:
I've checked database and wp-config.php file, no problem there.
I've checked wp_options > wp_user_roles, and tried replacing as described here,
http://wp-relief.com/2011/12/01/user-roles-in-the-wordpress-database/
Wordpress version 3.5.2

Any suggestions?
Jerry LAsked:
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Jason C. LevineNo oneCommented:
Did anything change during the move?  New path, new URL?
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Bernard S.CTOCommented:
Open your browser options, delete all cookies related to this site, clear the cache.
Close the browser, then reopen it.
1 - Is the problem still present?
2 - If yes, try refreshing the page
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Jerry LAuthor Commented:
SOLUTION: Changing the installation folder from public_html to a sub-folder was not a problem. However, changing the database table prefix to something other than the default was causing the problem.
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Jerry LAuthor Commented:
jason1178's comment caused me to think of what else had changed.
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