I reccomend that you first do a full download from LOTW including QSL card confirmations this will update your QSO'S including the granted status, then you can just edit the few that may or may not be missed

Think your doing something wrong because it works for me as described in the user guide

Upload only for QRZ until such time as they provide a download facility for external logging software

Going to play aerials now, let me know how you get on

That should be fine I also run portable from the cloud (Google drive) and have done for years OK it does seem that you have lost all of your data so here is my recommendation 1. Create a new Log4OM database - File/Open/New Database but locate it in the P:\Log4OM Portable folder, not in the config fo...

Is the P drive a removable drive like usb stick or similar

Where is the sqlite database stored, full path please

Also where is the portable version running from, again full path please

OK In recent QSO window F7

Click the 'Refresh' button at the bottom left corner and report back if the QSO's are displayed and if so what the QSO count is just below the refresh button