Dashboard not loading some sites

When switching between several sites from the dashboard, some are resulting in a reload of idsite=1. The site that I am switching to does have data, and I do not see any error messages. A network capture shows that piwik returns a 302 code with the following as the location: index.php?module=CoreHome&action=index&idSite=1&period=&date=yesterday

I do not see any error messages on screen or in database.

Any thoughts?

Problem Resolved.

ts_created was set to 0 in piwik_sites. For whatever reason Piwik did not like this. This was due to a direct import of websites using MySQL import. Once ts_created was given a valid day, those sites can now be viewed in the dashboard.