I've got an app that communicates with midi devices, this app worked fine for years, however since MacOS 13.3 and iOS 16 users complained about strange behaviors. After days of debugging I found out that the USB Midi Packets sent are sometimes invalid (wrapped in sysex headers). Here is the extract used to sent a single midi message UInt8 mBuffers[100]; MIDIPacketList* packetList = (MIDIPacketList*) mBuffers; MIDIPacket* packet = MIDIPacketListInit(packetList); MIDIPacketListAdd(packetList, sizeof(mBuffers), packet, 0, messageLength, (Byte *) messageData); printf("Sending %i bytes ", messageLength); for (int i = 0; i < messageLength; i++) { if (i > 0) printf(":"); printf("%02X", (Byte)messageData[i]); } printf("\n"); fflush(stdout); status = MIDISend(outputPortReference, endPointReference, packetList); Here is the output of the program when the issues occurs: Sending 3 bytes E0:00:00 Sending 3 bytes D0:00:00 Sending 3 bytes E1:00:00 Sending 3 bytes D0:1B:00 Sending 3 bytes E2:00:00 Sending 3 bytes D0:2B:00 Sending 3 bytes E3:00:00 Sending 3 bytes D0:3B:00 Sending 3 bytes D0:4A:00 Sending 3 bytes D0:5A:00 Sending 3 bytes D0:6A:00 Sending 3 bytes D0:79:00 The data rate is relatively high (~100ms per message) However when looking at the usb stack, the following data gets sent: 0e e0 00 00 -> Match 0d d0 00 00 -> Match 04 00 e1 00 -> WRONG - wrapped in Sysex 04 00 d0 1b -> WRONG - wrapped in Sysex 0f 00 00 00 -> Padding 0e e2 00 00 -> Match 0d d0 2b 00 -> Match 04 00 e3 00 -> WRONG - wrapped in Sysex 04 00 d0 3b -> WRONG - wrapped in Sysex 04 00 d0 4a -> WRONG - wrapped in Sysex 0f 00 00 00 -> Padding 0d d0 5a 00 -> Match 0f 00 00 00 -> Padding 0d d0 6a 00 -> Match 04 00 d0 79 -> WRONG - wrapped in Sysex 0f 00 00 00 -> Padding I can't explain anymore why this is happening and looking for some advice. Since I can't debug on that level on iOS I can only guess that the root cause is the same. Does anyone know about such an issue? Any ideas how to further debug?

I've noticed that I can't purchase anything anymore using my iOS 9 devices, and I got reports from multiple customers using iOS 9 devices that they are facing the same issues. Does anyone know what's going on here? In my case it tells me to accept a new license agreement, opens the AppStore and shows a blank page. Using the same apple id I can make purchase on newer ios versions (without getting any license agreement confirmation dialog) For my customers they get a blank page when confirming the purchase (also in the AppStore dialog). This is a real issue for me since the Apps I'm distributing are for professional/industrial usage where long device lifetimes are common. Actually my top 4 downloads platform version is still iOS9. Here are some screenshots: