[tde-users] kdiskfree-trinity - displays info as 0 for some hard drives

It is a puzzle. This utility will display information about external hard drives, which are variously formatted (as ext3, ntfs and vfat or exfat), and also displays info for internal hard drives which are formatted as ext3; also, my root and home directories, which are formatted as ext4. Yet it displays two other internal hard drives (formatted as ext4) as unmounted (though they are mounted and completely accessible for me as sole user); also it displays their information as 0 capacity and 0 used/free. I am not worried about running out of space (yet), as these are new hard drives, 6 TB and 8 TB, but eventually I would like to know. I know that I can use command-line to get the information, but I would like just to be able to look at kdf without the hassle of running commands. I am running Devuan Beowulf, just updated the repos and installed upgraded packages. The hardware is a Frankenstein's monster, but otherwise is running without issues. Any clues about what's going on? Thanks for any help. Bill