Muse keeps closing down upon uploading to BC, randomly. The closing down seems independend from the Muse file itself (happens from time to time with every site I upload).
Last year I received an extra file ("MuseDebugPrefs.xml") from Zak Williamson after I had many crashes, the file was to be added into my documents folder, it worked pretty well. Now with Muse 2018 and my issues with uploading I thought that file might disturb the current version and so I removed it from my documents folder - but there was no improvement.