Category showing emty despite 2 existing categories

Hi support,

I've installed Snapshot on my test network and I'm getting an unexpected error message regarding just one table:

Error Tables - These tables are skipped for the noted reasons.

wp_sitecategories – MySQL DESCRIBE table returned empty

The table does have two records: uncategorized and news.

The WP network is running on a dedicated server with Centos6.2, Apache2.2.15, Nginx as proxy, MySQL5.1 and PHP 5.3.3 as PHP-fpm.

Thanks in advance for your time and support.

Best regards,

Eric Koch