track vanished when correct altitudes

[tcholpon]

Hello,
My track vanished after I tried to correct the altitudes via "filtre de lissage" ? (Option unfortunately set in global options : correct via DEM, but no DEM files loaded, dont know if it accounts for, previously, i otfen corrected altitudes without any issue )
Is it possible to restore the data base to solve this pb ? I'd like to find my track back
Thank You !