You still have not fixed your bug and I know you are simply not interested in fixing it.

Hi, Thanks for your help but as I know exactly how the file is structured (it becomes a read only data file) I managed to read it with no problem using similar functions from my Objective-C code. Regards, Paul

Apple did slightly fix their bug but not 100% fixed. It's now been 2 years and the ticket is still open. Doesn't matter anymore as the schools which were using my app have moved to ChromeBooks and we have an online site especially for them.

Found it, fixed it. recorderDefaults = [AVFormatIDKey: Int(kAudioFormatMPEG4AAC), AVEncoderAudioQualityKey: AVAudioQuality.min.rawValue] Don't use kAudioFormatMPEG4AAC.

What a surprise! Apple's bug still exits in 15.1. How do I claim, from Apple, lost revenue and the tarnish of our reputation because of Apple's inability and/or indifference to fix this bug?

More info... Apple's bug first appeared in iOS 14, iOS 8,9,10,11,12,13 had no problem. My data for the App was created on macOS 10.9 (or earlier, don't remember) and I've noticed reconstructing the data was no problem on subsequent flavours of macOS until Big Sur which now has the same bug as in iOS14 - it shows exactly the same problem when rendering a PDF. The PDF displays without problem in Safari, Adobe, Microsoft Edge, IE, and Firefox, Opera, Brave, Chrome on Linux and Windows. Obviously it's something Apple did.

Quinn, thank you again for all your help. It all works on the new M1 Mac-mini (cheapest one).

Eskimo, thank you very much for your help. But I do I tell the ones I'm not using? I've just bought a M1 mac-mini and now want to move development to it (I still have another 2 computers that I use occasionally for development but wish to stop using them now as they are quite old, years-2010 and 2012). Any tips, so I dont mess up? Regards, Paul

On a new machine I install everything fresh and copy the projects from the old computer to the new one. I don't know how I got so many certificates. Can I delete (revoke) most of them? I would like to get rid of those I don't need and simplify life.

Hi, Still having trouble. Just wondering... (I've moved development back and forth from 3 or 4 computers over the last few years.) How many certificates do I need? I have:- 5 Developer ID Application macOS, all current. 2 Mac Installer Distribution macOS, all current. 1 Distribution for ALL, current. 3 Development for ALL, all current for 3 computers. Can I delete most certificates and only keep 1 each for:- 1 Developer ID Application macOS. 1 Mac Installer Distribution. 1 Distribution ALL. 1 Development for the current computer I'm using now. If I do that will xcode work it out without too much messing about? Any help appreciated. Thanks Paul