Salesforce Field Service: Dispatcher Console Hangs at "Loading Service Territory Members" Due to Corrupt FSL__FavoriteTerritories__c Value

This section explains how to resolve a Salesforce Field Service Dispatcher Console that hangs indefinitely at Stage 4 ("Loading Service Territory Members") due to a corrupt or malformed value in the Favorite Territories field (FSL__FavoriteTerritories__c) on the user's Field Service user settings record (FSL__UserSetting__c).
During Stage 4, the Dispatcher Console reads the Favorite Territories field (FSL__FavoriteTerritories__c) from the user's Field Service user settings record (FSL__UserSetting__c). This field stores a JSON-formatted string mapping Service Territory record IDs to boolean values — for example: {"0HhXXXXXXXXXXXXX": true}. This JSON tells the console which territories to load as favorites.
When the field contains a malformed value — corrupted JSON, unexpected characters, truncated content, or an incorrectly structured string — the console's JavaScript parser fails silently. The loading process hangs indefinitely without raising a user-visible error.
Because the failure occurs at the data-parsing layer (not the access-control layer), no combination of permission sets, sharing rules, or profile changes resolves the issue.

Steps to Resolve the Dispatcher Console Hang at "Loading Service Territory Members" in Salesforce Field Service

1. Identify the affected user's FSL__UserSetting__c record. Using Developer Console, Workbench, or a connected API tool, run a SOQL query on the Field Service user settings object (FSL__UserSetting__c). Filter by the FSL__User__c field equal to the 18-character Salesforce User ID of the affected dispatcher, and return the record Id, the Favorite Territories field (FSL__FavoriteTerritories__c), and the FSL__User__c field.
2. Examine the value in the Favorite Territories field (FSL__FavoriteTerritories__c). A valid value is a JSON object with Service Territory record IDs as keys and boolean true as values. If the value is empty JSON ({}), contains non-JSON characters, is truncated, or has unexpected formatting, it is corrupt.
3. Clear the Favorite Territories field (FSL__FavoriteTerritories__c) by setting it to null.
4. Ask the affected user to reload the Dispatcher Console. All four loading stages should now complete successfully.
5. After the console loads, the user can re-select favorite territories through the Dispatcher Console territory picker. This repopulates the Favorite Territories field (FSL__FavoriteTerritories__c) with a correctly formatted JSON value.
6. If multiple users are affected, repeat Steps 1–5 for each user. Alternatively, run a bulk query on FSL__UserSetting__c to identify all records with a non-null Favorite Territories field value and inspect each for malformed content.