Hi,
This could be a known issue, the OS is mixing together the updates for two screens.
You can try two workarounds:
Disconnect the DisplayLink device while you are using AirPlay.
Use version 2.1 of our drivers. You'll lose the improved rendering but it should work.
We are investigating this further, can you let me know if any workaround works and the model of your iMac?
You can find it in Apple Menu->About this Mac->More Info the model is all the text above the processor information.
Cheers,
Carlo
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