Safe mode made no difference, I still have not figured oud where to enable or disable debug logging so I couldn't switch it off (or on...)
There are no environment variables AFAIK, Sigil itself has <SIGIL_DEFAULT_TEMP_HOME> for the temp folder, but I can't find any reference to it.
Finally I checked the local INI files and Sigil.ini was as large as 73 Mb! Observing the folder showed 5 temporary logfiles to appear (size 0) before anything happened after starting Sigil (empty). Then after closing appeared another 5 temp ini files and when the GUI had disappeared still another 5 showed up (and disappeared)! Amazing behavior.
After renaming the INI file everything worked as usual. The new INI file was 18 k in size even after I had SIGIL tuned to my preferences.
The culpit was the toolbars section from the [mainwindow]. I have no idea why it has grown to this huge size (308 K characters) while in the new created INI file it is only 3 K.
Thanks to KevinH en Diapdialer for their suggestions. I didn't do any weird things testing SIGIL, but keep wondering what actually happened ....
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