Bug: Cannot zoom to a selected line feature of an ArcMap Service
Particular line features are selected, either through an interactive selection or through a query. When using the zoom to selected function the map does not change. The application does not zoom to the selected features.
If the selected line features are horizontal or vertical, ArcMap Server will create an incorrect envelope. A zoom to feature request that uses this envelope will fail and return no results.
There is currently no workaround for this.