Changes were applied to improve security. See ADV-2019-022, and ADV-2019-023 in Security Bulletins for more details.
When viewing a viz that used Show Empty Columns and displayed totals, sometimes a "Session ended by Server" error occurred and LogicAssert tabvizql!PartitionInterpreter::ComputeTableConfig error could be found in the logs.
If the Hyper process stopped unexpectedly, other processes on the same node were restarted.
Date range filter sometimes excluded results from the bounding days of the filter.