file size in doublecmd is empty (Version: 0.9.8 beta)

I using doubleCommander in kUbuntu
File size for normal users is this days empty.
as admin its normal.
as user xy column size is empty heading and empty in each row.

i uninstalled doubleCommander and installed it again. with not changes.

Double Commander
Version: 0.9.8 beta
Revision: 9296
Build date: 2020/02/09
FPC: 3.0.4
Platform: x86_64-Linux-qt5
OS version: Ubuntu 20.04.2 LTS
Widgetset library: Qt 5.12.8, libQt5Pas 5.6.1