I just purchased and installed Multi-Sites and the YOOtheme plugin, and have patched files. However, in slave sites WidgetKit version 1.3.2 is broken in the backend, and frontend. I don't see anything else that would be causing the issues, as everything else appears to be fine.

Joomla version 2.5.9
Widgetkit 1.3.2
YOOtheme Template Tasty 1.0.0

Verify several things:

- Verify that the JMS patches for yothemes plugin is correctly installed and enabled.

- Verify that the widgetkit patch and also the themes is correctly patched.
See the "check patches" menu.

- In case where you deploy a website into a specific directory (generally the case for a domain or subdomain) then verify that you server has the correct document root value that has an exact matching with the "deploy folder" value. You can use the "hello.php" to display the path corresponding to the doamin, subdomain. See video 7.
www.jms2win.com/en/tutorial#jms12x-7

Yoothemes is very sensitive when the path (document root) is not correct.