Hi Jon,

thanks for responding. My apologies, in fact the upgrade was from 16.3 to 19.1. Is there know issues with 16.3 to 19.1?

For some reason labkey logs did not rotate properly, I don't have the logs for the change from 16.3 to 19.1. If it is vital to the troubleshooting process, I'll try to make a clone to recreate the issue.

There are other log files as below, is any of them useful?
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labkeyMemory.log
labkey-audit.log
labkey-action-stats.tsv.3
labkey-query-stats.tsv.3
labkey-action-stats.tsv.2
labkey-query-stats.tsv.2
labkey-errors.log.3
labkey-action-stats.tsv.1
labkey-query-stats.tsv.1
labkey-errors.log.2
labkey-errors.log.1
labkey-action-stats.tsv
labkey-query-stats.tsv
labkey.log.1
labkey-errors.log
labkey.log
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Regards,
Qing