My bad - NSPrintInfo.sharedPrintInfo is different from NSPrintOperation.currentOperation.printInfo Cheeky! Cheers, Jay

Interesting idea - I'll give it a try and report back. Cheers, Jay

Have you investigated the view hierarchy with Xcode's view debugger? This is commonly caused by views on top of the view in question 'eating' your mouse events.. Cheers, Jay

FWIW - I'm already using RSAppMovementMonitor (https://github.com/redsweater/RSAppMovementMonitor) but it won't detect the updater process swapping the binaries while the app is running..

Still getting frequent emails from confused customers as I have a customer base of .. casual Mac users who don't understand that the macOS Print Panel can be expanded to show additional, application specific settings. Any input from an Apple Engineer much appreciated. cheers, Jan

Ahh... the joy of Apple Help programming! Great (Nov. 2021) post on the topic: "Why won’t that Help book open?", https://eclecticlight.co/2021/11/16/why-wont-that-help-book-open/ Provides some tips when working on Help Books. I've found that copying an existing (e.g. Apple) help book and starting from there (adding content for your own app) worked best for me in the past. Even managed to enable print for (local) Help Books via reverse engineering Apple's user guides, something my users have been asking for.