A problem has been discovered with the use of LocatorHub locators in ArcGIS Online. When a webmap containing both a locator and a locally hosted ArcGIS Server service is saved and then reopened, searches against the locator fail to work. Our reference for this issue is FB51269.
A hotfix patch is now available to address this issue. The patch needs to be installed over LocatorHub 5.2 SP3 (184.108.40.2063), but only customers who wish to use LocatorHub Locators within ArcGIS Online need to install it.
If you wish to download the hotfix (LocatorHub 5.2 SP3 Hotfix 1) please contact our Customer Operations team at CustomerOperations@esriuk.com