Hebrew file names in Libreoffice

[Shlomo Solomon]

On my new Kubuntu 18.04 box, Libreoffice will not open files with
Hebrew names - says file does not exist. 

On a Windows 10 machine Libreoffice has no problem with the same files. 

And a really strange thing - if I run Libreoffice from the command line
instead of clicking on an icon or the KDE menu, it works fine.

I thought this was a utf-8 problem, but my locale seems to be correct.

$ locale
LANG=en_US.UTF-8
LANGUAGE=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=en_US.UTF-8

What am I missing?

-- 
Shlomo Solomon
http://the-solomons.net
Claws Mail 3.16.0 - Kubuntu 18.04