I have logged a call (#160038) about this issue but I thought I would reach out to the community to see if anyone has come across this before.
I have a custom property that is used to restrict some users from seeing network devices. This works well except that when these restricted users try to view syslog messages for their unrestricted devices they get nothing back. When I (no restrictions) look at syslog the messages have arrived and have been logged in the SW database. The custom property only applies to switches and routers I can see no link to any syslog settings.