The following error occurs when a job is scheduled to run now, and then after it has completed I press the Design tab.

It is occurring in IMan v5 PU10, on a dedicated IMan server with IMan and IIS only, on windows server 2019.  I suspect it was happening for some time in v4 on a different server, but it was not documented.  Occurs in both Chrome and Firefox.

IMan - An Error Has Occured
Error - Object reference not set to an instance of an object.
Error Stack Trace
at Syncfusion.Web.UI.WebControls.Grid.Grouping.GridGroupingControl.LoadSourceListSet()
at Syncfusion.Web.UI.WebControls.Grid.Grouping.GridGroupingControl.LoadViewState(Object savedState)
at System.Web.UI.Control.LoadViewStateRecursive(Object savedState)
at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState)
at System.Web.UI.Control.LoadViewStateRecursive(Object savedState)
at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState)
at System.Web.UI.Control.LoadViewStateRecursive(Object savedState)
at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState)
at System.Web.UI.Control.LoadViewStateRecursive(Object savedState)
at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState)
at System.Web.UI.Control.LoadViewStateRecursive(Object savedState)
at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState)
at System.Web.UI.Control.LoadViewStateRecursive(Object savedState)
at System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState)
at System.Web.UI.Control.LoadViewStateRecursive(Object savedState)
at System.Web.UI.Page.LoadAllState()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Do you know what may be causing this?