Recent changes to how Safari handles printing (Safari 10.1.2 and above) have forced us to change how printing works in Gentu for users in this browser.
Printing in Gentu when using Safari will now require users to disable the pop-up blocker functionality of the browser. Attempting to print while the pop-up blocker is active will produce an error in Gentu.
To disable the pop-up blocker, please navigate to Safari > Preferences in the menu bar, then select the 'Security' tab.
Untick the 'Block pop-up windows' checkbox.
You should now be able to print again in Safari.
Please note that the printing behaviour is now slightly different; rather than simply display the print dialogue, Gentu will open the document in a new tab before displaying the print dialogue.