cannot download diagnostic report

[Fuji San]

After I have done running the diagnostic report, the blue "download report"
button shows up.
But when I click on it, a popup windows asks me if I want to save the
file"sos-report-hostname-20171026143147.tar.xz".
When I click "Save", the popup closes and well nothing else happens! No file is
saved.
The browser does not show any downloaded file.