Issue with SharePoint 2013 Upgrade

Question

I am facing issue with SharePoint 2013 site upgrade. Scenario is follows:

1. I took backup of database from 2010 environment
2. Attached it to 2013 web application
3. Now the site was accessible in 2013 environment with 2010 look and feel
4. Exported this 2013 site and imported it on different site collection on 2013 environment which was already upgraded to 2013 look and feel.
5. After import, site is in 2010 look and feel and it is not allowing me to upgrade it to 2013 look and feel(visual upgrade).

Answer 1

I had the same problem, you need to install the next CU of your version. This is a bug of a specific version of sharepoint 2013 SP1.

check this article with all build versions.