Editing more than one logbook entry can result in the aircraft trail (GPX) being dropped from the edited entries.

Export the log to CSV or create a copy of the file
C:\Users\YOURUSERNAME\AppData\Roaming\ABarthel\little_navmap_db\little_navmap_logbook.sqlite
on Windows to have a backup. See manual for the file location on other OS.

For now do not use the bulk edit in the logbook.

Apologies for the nuisance.😞

Alex

Fixed with 2.6.18