We have a spatial table in a SQL Server enterprise geodatabase - data type is GEOGRAPHY. We have then created spatial views of this table. These spatial views have then been published as a map image layer to ArcGIS Enterprise 10.6.1 from ArcGIS Pro 2.4.2. The resulting map image layer displays as expected in ArcGIS Pro 2.4.2 and interacts with the time enabled properties. However, when this map image layer is added to the 2D map viewer in Portal 10.6.1, the browser crashes. Interestingly, when adding all the individual feature layers (e.g. layer 0 from this map image layer) it is fine and we cannot replicate the crashing behaviour in the 2D map viewer.