A layer in your map has a data source that references a dynamic map service. Since basemap layers use a display cache, a dynamic map service that changes periodically may not display the most up-to-date content when contained in a basemap layer. This may result in artifacts in the display of the layer as the display cache is populated over time.
Solutions
- Move the dynamic map service out of the basemap layer. This will force the service to draw new content from the server each time the extent changes, ensuring the correct display.
- Leave the service in the basemap layer and be aware that display artifacts can occur.
More information
Basemap layers are intended for basemap content. In most cases, basemap content will be served via cached map services. Cached map services perform well in basemap layers and are the recommended way of sharing cached content.