Can anyone tell me why I can no longer print from LR5. I get the message "unable to start print" when I hit the print button. I've been printing from this program for over a year with no problem. I recently upgraded to windows 10 and I don't know if the problem is related to the upgrade or not. Has anyone else had this problem?
First step would be to update your Printer drivers.
then, check if you are able to print fine from other programs apart from Lightroom.
Also, update Lightroom to version 5.7.1 and then, check : Adobe - Lightroom : For Windows : Adobe Photoshop Lightroom 5.7.1