ArcMap crashes or an error loop appears after changing the table appearance option for Display coded value domain and subtype descriptions when a cell with a drop-down list is being edited in the table.
The workaround to avoid this is to make sure a field with a drop-down is not active at the time the subtypes/domains appearance option is changed. If the cell is active, you can also click or arrow over to another cell to give the drop-down a chance to refresh before you start editing the values in the cell again.