I updated to LR6.3 about a month ago. I am not able to print my photos now on my Canon MG7120 printer but I can print from other apps(i.e. Office,Mail etc). I was able to print photos using LR6.1. The Lr app appears to go through the normal sequence of steps to print 9 ie.starting to load the photo but it never does). And I have to force quite because LR can't be shut down normally. Any suggestions?
Please follow the below steps and see if this helps.
> Uninstall the printer.
> Download and reinstall the latest printer driver
> Follow the link to setup printer in Lightroom
Let me know if this helps.