My adb.exe process crashes when I try to connect to the Android emulator (Android Stusio 3.4.1) from TestComplete (Version: 12.60.5545.7 x64). If I use "Show mobile Screen" button to connect to the emulator device, I see "Unable to connect to the device with ID" message. The mobile troubleshooter shows in the connection status: "Failed: Unable to connect to the device with ID..." mkdir /data/local/tmp/TestComplete was failed. mkdir /data/local/tmp/TestComplete File exists.
You should see the Run Troubleshooter link in the Select Current Device dialog. Click it - this will help you troubleshoot the connection issue.