I'm assuming the update is the root cause of this issue. This code worked previously and now causes an error "You need to have a DynamicManager control on the page and register your data control with it in order to use a DynamicControlParameter". The RadListView is not compatible with a DynamicManager control.
The code causing this error:
rlvLocations.InsertItemPosition = RadListViewInsertItemPosition.FirstItem
rbtnAddLocation.CommandArgument = rdlMembers.SelectedValue
The offending lines are the two with rlvLocations.
Updates are really getting frustrating to new Telerik user here.