Hello.
I am trying to add the code, which provided by AddThis, into file .../templates/mytemplate/html/com_virtuemart/productdetails/default.php in order to create sharing buttons, but when I choose a child product then buttons disappear.
Any suggestion will be helpful.
Virtuemart 3.2.12
Joomla 3.8.5
Your problems is because script is loaded on document ready, when you reload, you have to check if document is ready load script directly.