macOS 15 brings many new security features that the manufacturer has not really thought through. Changes to network filters and firewalls cause current professional security solutions to sometimes fail, and monthly requests for video conferencing and screenshot tools are annoying users. But Apple has also made unpleasant changes at another level – apparently also for security reasons – that may annoy users after upgrading to Sequoia: in support for system-wide keyboard shortcuts.
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Control instead of choice – but why?
The makers of professional screenshot app Shottr, already hit with disruptive screen access demands, found standard hotkeys no longer works as intended. “Starting with macOS Sequoia, Apple no longer allows global keyboard shortcuts where the Option key or Shift plus Option are the only modifiers.” Confusingly, this only affects the Option key, not Control (also called Control on PCs). For example, if you defined a hotkey like Option + letter, you won’t be able to use it after upgrading to Sequoia.
The solution is to switch to Control+Letter or alternatively add the Command key to the hotkey. Apps that do not use the hotkey API provided by macOS and instead listen to keystrokes with their own routines are apparently not affected by the issue. However, this is not recommended by Apple and may also degrade the battery capacity of MacBooks.

With questionable justification: apparently intended by Apple
Other popular apps include the open source clipboard manager Macy are also affected And currently there is no solution other than the above recommendations. On Reddit Further reports on apps suffering from the change are summarized below. Anyone who uses automation tools like Keyboard Maestro should also check their hotkeys.
As part of the Open Feedback Assistant on GitHub The problem has already been identified. There is speculation that this is a Changes sought by Apple It works. A “framework engineer” at Apple writes in the developer forum that it’s intended to prevent “key-logging malware” Keystrokes in other applications Cutting along. The problem was that “alternative characters in password” could be generated using Shift+Option. So there is no workaround – as rare as this threat may be. Sequoia now always requires a modifier that is not Shift or Option.
(B.Sc.)