After upgrade of a few SME Server 7.4 to 7.5 yesterday, I see the following errors in the logs:
LibClamAV Warning: Detected duplicate databases /var/clamav/main.cvd and /var/clamav/main.cld, please manually remove one of them
Looking into one of those servers, it looks like this:
-rw-r--r-- 1 clamav clamav 56671744 Feb 15 18:45 main.cld
-rw-r--r-- 1 clamav clamav 22906487 May 19 23:39 main.cvd
(In a hurry, don't have time to report to bugtracker right now, will do that later)