Can you share a screenshot of this strange purple artefact? Or several of them if they (presumably) accumulate?

The same happens with the NOTAM circles, i.e. yellow highlighting is not shown.

Does anything else fail to appear? It sounds like quite an edge case, where perhaps not all drawing commands are implemented by the device.

Tim,
your feedback made me download the new version to my main device (Samsung Tab S 8.4), where it indeed fully operates to expectations.
Still, on the Huawei P8 it does not. Tried everything, including re-installation, re-booting, changing all kinds of device and Skydemon settings. It simply does not highlight the air spaces any more.
Both Huawei and Samsung are running on Android 5.0.  

There has not been any change to this functionality, and it appears to still be working on our test devices.

Anyone else?

When tapping / holding the finger on the screen, a pop-up window offers information on all air spaces related to the selected coordinates (i.e. where you tapped the screen).
In the past version 3.4.1: when you select information for an air space from the pop-up window, the air space boundaries become briefly highlighted on the map. the yellow highlighting fades out after several seconds. That is just perfect.

Problem description:
In new version 3.4.2.20312: When selecting one particular airspace information from the pop-up window, the respective airspace will NOT be highlighted any more. 

I restarted Skydeam, then Mobile device and Skydemon and eventually I re-installed the entire latest Skydemon Androi App.  .... without success
Is it an intended functionality change or simply not working correctly?
Anybody else here who made the same experience?

System info: Huawei P8, type ALE-L21, Android 5.0 (unchanged)