An error similar to the following may be seen in the a.log files:
Circular reference detected during delta filter membership update. Filter memberships may be not be updated correctly.
A filter contains a circular reference in a sub filter. Guid of filter where discovered = b57dfb8b-eb5a-450d-b52e-30d2611ce12c.
Parent list for this filter: b57dfb8b-eb5a-450d-b52e-30d2611ce12c
There is a circular reference in a filter or set of filters.
A filter references it self as a filter to be based upon.
A chain of filters has a reference back to one of its members.
In the SMP log viewer make sure you have the database connectivity set up.
In the Log viewer detail pane click on the two GUIDS.
In this case they will be the same filter. To resolve it:
This may take some digging through depending on how many filters are in the chain. To resolve:
NOTE: The follow KB contains a FIND GUID query that can also help identify the filter associated with the GUID: