It may have something to do with W10Privacy, O&O ShutUp10 and Destroy Windows Spying. Those apps modify the OS heavily in order to block Microsoft from spying on users, but sometimes they block features used by normal software. I tried to disable all the options in W10Privacy and O&O ShutUp10 (Destroy Windows Spying doesn't have revert option), but it didn't help.
Log from "Debug.txt" probably won't help, since it looks like this:
Is there a debug version anywhere so more information about the reason for this behavior can be obtained?Logdatei MyPhoneExplorer
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Programmversion: 1.8.9 portable
Datum: 09.06.2018
09:16:29.39 Machine works as Double-Byte-Character-System!
09:16:29.39 Windows Version=10.0
09:16:29.39 Setting Port: 999
09:16:29.39 Setting Baud: 115200
09:16:29.39 Avaiable Ports: COM0=;
09:16:29.41 Main Load frmSplash
09:16:29.46 Load frmSplash...
09:16:29.89 Hauptfenster wird geladen
09:16:30.07 Sidebar fertig geladen
09:16:30.18 UC SMS wird geladen
09:16:30.22 UC Phonebook wird geladen
09:16:30.24 UC Phonebook fertig geladen
09:16:30.24 UC Calls wird geladen
09:16:30.29 UC Organizer wird geladen
09:16:30.35 Organizer initiated
09:16:30.41 Startpage=1
09:16:30.43 UC Filebrowser wird geladen
09:16:30.49 UC Filebrowser fertig geladen
09:16:30.49 UC AppBrowser wird geladen
09:16:30.50 UC Notes wird geladen
09:16:30.52 UC Calls wird geladen
09:16:30.55 Setting Lastuser: Xiaomi MI MAX [869270026829746]