Windows app crash when trying to change audio device

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Bembel

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I have recently changed the headset from a Jabra Engage 75 (DECT) connected via USB to a Jabra Evolve 65 (Bluetooth) connected via Jabra Link 370 USB dongle in the office and a Jabra Link 360 USB dongle when working remotely.

Now today I wanted to use the Evolve 65 via the Link 360 but the 3CX Windows app would instantly crash when trying to set the correct speaker/microphone combination in the settings.
This is what I could find in the log file at the time it crashes:

[11.12.2019 08:29:02.964][1] audio device #0: "Primary Sound Driver", input=2, output=2, guid=''
[11.12.2019 08:29:02.964][1] audio device #1: "Microphone Array (Intel... Smart Sound Technology (Intel... SST))", input=2, output=0, guid='{0.0.1.00000000}.{7e7425bb-8370-4c6f-850d-9fdabc07d729}'
[11.12.2019 08:29:02.964][1] audio device #2: "Kopfh...rermikrofon (2- UC Mono Bluetooth Wireless (Sound Research.", input=2, output=0, guid='{0.0.1.00000000}.{fb9ca853-03d3-4d6c-82c3-21eed9fd4c33}'
[11.12.2019 08:29:02.964][1] audio device #3: "Speakers (Realtek(R) Audio)", input=0, output=2, guid='{0.0.0.00000000}.{3c7a6cd7-64c0-4bc9-a090-8c5bba837ea3}'
[11.12.2019 08:29:02.964][1] audio device #4: "Kopfh...rer (2- UC Mono Bluetooth Wireless (Sound Research))", input=0, output=2, guid='{0.0.0.00000000}.{993c11e6-4bbb-4e30-82e9-2e45de96aff9}'
[11.12.2019 08:29:08.300][1] Error occurred in application current domain - app domain unhandled exception
[11.12.2019 08:29:08.309][1] System.ArgumentException: '.', hexidezimaler Wert 0x02, ist ein ung..ltiges Zeichen.

Microsoft Skype for Business and Teams work just fine...same problem by the way with my Jabra Elite Sport true wireless headset.

I am running a Windows 10 (1809) Enterprise 64Bit German, 3CX app for Windows (16.0.1.81) and the 3CX PBX on 16.0.1.273.

Anyone got an idea how to solve this?
 
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