When using EzeScan Routing as a service, and Routing rules are saving to a network path you must ensure that the EzeScan Service account has write access to them.
When Routing is run in UI mode EzeScan uses the current user login to store to the network path. So this functionality will work ok.
When Routing is run in service mode it uses the Local System account. This account will not have permissions to network paths. It is advisable to configure the EzeScan Routing service with a domain login which has local administrator access and write access to all network paths that the Routing rules are configured for