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For me the problem is that though all programs are running:

LocalFileLauncher 5.0.6 © Taggtool Ltd., Inc, 2015
Taggtool 5 5.0.6 © Taggtool Ltd., Inc, 2015
|-Taggtool 5 Server

there is no GUI at all!
Double clicking Taggtool 5.exe results in minute program window blink and that's all.


There is also no single entry in neither log file.

(Windows 10 Pro)