Strace log attached
Hm, unfortunately doesn't give me a further clue.  The
10691 access("/home/tc/.config/libreoffice/4/user/config/soffice.cfg", 
F_OK) = -1 ENOENT (No such file or directory)
may have been a false route after all; I was under the erroneous expression that that part
of the user profile gets copied over from the installation's preset/ tree, but that isn't the 
case.
So you need to go back to the debug suggestions I gave earlier.
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