Does your spam check have intermittent failures?

I have recently discovered the following error messages appearing together in my spam filter logs:

•  spam acl condition: cannot parse spamd output
•  Warning: ACL "warn" statement skipped: condition test deferred

When this occurs, the antispam check is skipped - there is not "ctasd results" message -- so the message will be allowed unless a static rule causes it to be blocked anyway.

It does not happen very often but it has happened on enough days during the last 2 months to get me worried.

I have a case open with support, but of course Level 1 has no idea what it means.  I expect to have trouble with escalation because I am running version 9.506-2, which I consider the "most recent stable release".   

So I am asking others in this forum to search their spam logs, see if they are also seeing this message.   Then please open a support case and summarize your findings here.