hello I have same problem, until yesterday it worked perfectly but now today I update all files with italian version of zencart (before and now 1.5.0)
I access to admin page correctly, but I have this error
WARNING: An Error occurred, please refresh the page and try again.
On italian default template I see link to login, on a template that I downloaded free I see only that error.
I attach here message of debug, but I don't know how to solve
[05-Aug-2012 15:14:36 UTC] PHP Fatal error: 1146:Table 'mysitezencart150.ezpages_content' doesn't exist :: select e.pages_id, e.toc_chapter, e.page_open_new_window, e.page_is_ssl, e.alt_url, e.alt_url_external, et.pages_title from ezpages e, ezpages_content et
where e.pages_id = et.pages_id
and et.languages_id = '1'
and status_header = 1
and header_sort_order > 0
order by header_sort_order, pages_title in /var/www/mysite.com/www/ingrosso/includes/classes/db/mysql/query_factory.php on line 101
please any advice?