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I've got MacBook Pro with macOS Mojave 10.14.6 and an external monitor connected through "j5create JDC 381" USB-C to HDMI adapter.

Weird thing sometimes happens when using Chrome - when it's on the external screen it sometimes stops responding. I have to kill it through Activity Monitor BUT the window stays displayed even after the process is killed. It completely makes the monitor unusable and I can't do anything about it - I tried unplugging the HDMI adapter, power off/on the monitor, switch display mode to mirror and back, etc. Only reboot helps.

Any ideas how to "unblock" the external screen without reboot when something like this happens?

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I had the same issue with Mojave 10.14.6.

The j5Create worked perfectly until installing the supplemental update to the OS. With Apple trying to fix blacked-out/locked screen issue, whatever they did in the update broke j5Create.

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I had this problem and it was the USB-C to HDMI adaptor. I changed brands, I now have insignia (best buy brand) and the issue went away. I don't know if it was a compatibility issue or if I just got a bad one... I don't know what about the different adaptor fixed it.

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  • Adapters are usually the weakest link. I've found from personal and professional experience that Belkin® and Anker® brand adaptors are top of the line. (Disclaimer: no financial ties to Belkin or Anker.)
    – IconDaemon
    Jul 25 '19 at 0:15

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