LOTW upload Freezes

[M0RWX]

I am in the process of migrating my electronic logbook to Log4OM and stumbled across the same issue.
An attempted LotW upload would either freeze with the last sentence 'MANAGED MODE SET" or alternatively with some other upload attempts would just show a single line: "LOTW END" without any further details. A restart of the program never fixed it for me.

In my case, it turned out to be a data quality issue.
The fields MyCountry and MyDXCC did not correspond to the StationCallsign in the log and therefore did not match what LotW expected.

I have many different profiles, foundation, intermediate and full license for home QTH and portable in England, Wales & Scotland as well as several variations whilst operating abroad, each with their own DXCC.

I assume that during one of my batch imports, I inadvertently had not selected the correct profile and that during the import, these two fields were overwritten according to my incorrectly set profile.
When I used the QSO Manager > Single Field Update functionality, the MyCountry field correction automatically also corrected the MyDXCC field as well.

I was then able to upload to LotW without any errors.

Whilst any of the issues experienced by others may have different reasons, it may be worth checking the integrity/validity of the fields in the logfile as that could be the reason.