​We are using the Popups API and Popups: Add and Reference to create new nodes in a popup window. For example, you are registering an invoice in Maverick and the necessary creditor does not exist in Maverick yet. You can click on the link 'Add New: Add Creditor'  to add a new creditor in a popup screen. The popup window opens: After entering the necessary details, you click on save. We experienced the loading sign kept spinning. and nothing happened. In the...