Amavisd and Clamav socket problems

Hello Til,
Hope you can help me...

I've had a successfully working ISPConfig 3 installation for a little while now. However, I have updated to ISPConfig 3.1.9 recently - and this is when things start going very wrong for me. The Amavisd - whatever I try to do - refuses to operate correctly:

In /var/log/maillog, I get a loads of:

Dec 17 16:40:44 vds amavis[4921]: (04921-01) (!)connect to /var/run/clamav/clamd.sock failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.sock: No such file or directory
Dec 17 16:40:44 vds amavis[4920]: (04920-01) (!)connect to /var/run/clamav/clamd.sock failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.sock: No such file or directory
Dec 17 16:40:44 vds amavis[4921]: (04921-01) (!)ClamAV-clamd: All attempts (1) failed connecting to /var/run/clamav/clamd.sock, retrying (2)
Dec 17 16:40:44 vds amavis[4920]: (04920-01) (!)ClamAV-clamd: All attempts (1) failed connecting to /var/run/clamav/clamd.sock, retrying (2)
Dec 17 16:40:50 vds amavis[4921]: (04921-01) (!)connect to /var/run/clamav/clamd.sock failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.sock: No such file or directory
Dec 17 16:40:50 vds amavis[4920]: (04920-01) (!)connect to /var/run/clamav/clamd.sock failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.sock: No such file or directory
Dec 17 16:40:50 vds amavis[4921]: (04921-01) (!)ClamAV-clamd av-scanner FAILED: run_av error: Too many retries to talk to /var/run/clamav/clamd.sock (All attempts (1) failed connecting to /var/run/clamav/clamd.sock) at (eval 114) line 608.\n
Dec 17 16:40:50 vds amavis[4920]: (04920-01) (!)ClamAV-clamd av-scanner FAILED: run_av error: Too many retries to talk to /var/run/clamav/clamd.sock (All attempts (1) failed connecting to /var/run/clamav/clamd.sock) at (eval 114) line 608.\n

Not happy. Consequently, no email has been delivered for a while now (although luckily it is queued).

Some stats:
Server is:
Linux xxxxxxxxxxx 2.6.32-696.16.1.el6.x86_64 #1 SMP Wed Nov 15 16:51:15 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Amavis is showing as: amavisd-new-2.9.1 (20140627)
Clamav is showing as: ClamAV 0.99.2/24137/Sun Dec 17 13:09:36 2017
selinux is permissive

I understand that the problem probably lies around the way that amavis.conf is configured, but I'm getting rather stuck.

Any help would be apprechiated.

Thanks


Max