I am getting the same error on Ubuntu 18.04: (KNIME:28232): Gtk-CRITICAL **: 15:00:01.375: gtk_box_gadget_distribute: assertion 'size >= 0' failed in GtkScrollbar
and also another warning: (KNIME:28232): Gtk-WARNING **: 15:00:01.706: Negative content width -1 (allocation 1, extents 1x1) while allocating gadget (node trough, owner GtkProgressBar)
So I guess it is not only CentOS. Looking forward to having this issue resolved.
Best regards,
Johannes