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Updating to macOS Sonoma 14.4 is breaking the functionality of some USB hubs, according to reports across the web – though it's unclear how widespread the problem is, or which particular peripherals are affected.
The heads-up first came via AppleInsider readers, but there's also some discussion on Reddit, Apple support forums, and MacRumors. So far, it appears to be just USB hubs built into monitors affected by the bug, including models from Dell, Samsung, and Gigabyte.
Judging by the number of replies to the article and threads linked above, several people are seeing this issue. That said, it doesn't appear to affect everyone with a macOS Sonoma 14.4 machine and a monitor USB hub.
Apple hasn't said anything about the issue and is unlikely to unless it becomes widespread. The 14.4 software update started rolling out last week, bringing with it new emojis and bug fixes – though it may have introduced some more bugs of its own.
Can you fix it?
The users afflicted by the USB hub problem are trying various troubleshooting measures. There doesn't seem to be a single solution that works for everyone, across different types of monitors and USB connections.
For some, completely powering down everything and then powering it back up again seems to work. Other people have reported that heading to the Privacy & Security page in macOS System Settings and changing the Allow accessories to connect option to Ask every time, then rebooting, fixes it.
Reading between the lines, there may be something awry with the way macOS 'sees' the USB hub and the devices connected to it as peripherals, but there are a lot of links along that chain – some users have found that simply switching to a different USB cable helps.
We'll have to wait and see if Apple issues a fix for those affected. Of course, if workaround solutions are already being discovered, it's more likely that any necessary bug fixes for the problem will get quietly rolled into the macOS Sonoma 14.5 update.