up and cross selling functionality is missing on the frontend

[yockl]

Hi all, 

I have an issue with the up- and cross selling functionality on the Magento store running on patch level 1.9.2.2. I have installed a new theme, which includes both functionalities, for testing purpose I have updated 2 product and add several cross and up selling products. But in the store frontend the tabs are missing. I have already try to fix this issue as follows: 

1. Refresh cash 
2. Refresh browser cash 
3. Reindex all
4. Check if up and cross selling functionality is included in the new theme - confirmed it is 

Is it possible to deactivate the complete functionality and if yes where I can check if the functionality is excluded from the shop? 

Thank you very much in advanced