I started getting this terribly un-useful alert a few days ago also.
I get it on every bootup and just got it when I start up Google Chrome
I looked in system.log for mention of master socket and found this at about the time the alert had popped up:
Apr 21 16:53:21 com.avast.helper[283]: Pop socket closed by peer
Apr 21 16:53:21 com.avast.helper[283]: Error connecting to master socket: connect(): Connection refused
Apr 21 16:53:49 com.avast.helper[283]: Pop socket closed by peer
I looked in avastdaemon.log at this time and found tons of entries like this for each tab being reloaded:
Sun Apr 21 16:53:20 2013 [SESSION 2977812480]: Input (normal): 'CHECKURL
http://1.gravatar.com/avatar/ad516503a11cd5ca435acc9bb6523536?s=67'.
Sun Apr 21 16:53:20 2013 [SESSION 2990592000]: Input (normal): 'SCAN /tmp/proxy-VuPNHL/fAUUyp CID webshield TRIGGER ON_WEB SOURCE
http://order.tupperware.com/coe-images/home/newhome_youtube.png REFERRER
http://order.tupperware.com/coe/app/tup_widget.show_page?fv_page_code=warranty&fv_section_name=help&fv_category_code=search&fv_item_category_code=200500'.
Sun Apr 21 16:53:20 2013 [SESSION 2990592000]: Scanning path '/tmp/proxy-VuPNHL/fAUUyp' started.
I looked in avastfileshield.log at the same time and found:
[61-warn] Sun Apr 21 16:53:13 2013 - avscan_handle_timeout: Timeout scan-end has occured
[61-warn] Sun Apr 21 16:53:13 2013 - avscan_handle_timeout: Timeout scan-end has occured
[61-warn] Sun Apr 21 16:53:13 2013 - avscan_handle_timeout: Timeout scan-end has occured
[61-warn] Sun Apr 21 16:53:15 2013 - avscan_handle_timeout: Timeout scan-abort has occured
[61-warn] Sun Apr 21 16:53:15 2013 - avscan_handle_timeout: Timeout scan-abort has occured
[61-warn] Sun Apr 21 16:53:15 2013 - avscan_handle_timeout: Timeout scan-abort has occured
[61-warn] Sun Apr 21 16:53:19 2013 - avscan_handle_timeout: Timeout scan-end has occured
[61-warn] Sun Apr 21 16:53:19 2013 - av_maybe_stuck: Daemon likely stuck. Restart it.
Cannot perform HTTP request. [1c]
[61-err] Sun Apr 21 16:53:21 2013 - avscan_handle_read: Lost connection to daemon.
[61-err] Sun Apr 21 16:53:21 2013 - avscan_handle_write: I/O error. Broken pipe [32]
[61-err] Sun Apr 21 16:53:21 2013 - avscan_handle_read: Lost connection to daemon.
[61-err] Sun Apr 21 16:53:21 2013 - config_load: ini_read() failed [-1]. Will use defaults.
[61-err] Sun Apr 21 16:53:21 2013 - avmaster_handle_read: Lost connection to daemon.
[61-err] Sun Apr 21 16:53:21 2013 - avmaster_open: connect() failed. Connection refused [61]
[61-err] Sun Apr 21 16:53:28 2013 - avmaster_handle_timeout: Timeout avmaster-welcome has occured.
[61-err] Sun Apr 21 16:53:30 2013 - avmaster_handle_timeout: Timeout avmaster-welcome has occured.
[61-err] Sun Apr 21 16:53:33 2013 - avmaster_handle_timeout: Timeout avmaster-welcome has occured.
[61-err] Sun Apr 21 16:53:36 2013 - avmaster_handle_timeout: Timeout avmaster-welcome has occured.
[61-err] Sun Apr 21 16:53:39 2013 - avmaster_handle_timeout: Timeout avmaster-welcome has occured.
[61-err] Sun Apr 21 16:53:42 2013 - avmaster_handle_timeout: Timeout avmaster-welcome has occured.
[61-err] Sun Apr 21 16:53:45 2013 - avmaster_handle_timeout: Timeout avmaster-welcome has occured.
[61-err] Sun Apr 21 16:53:48 2013 - avmaster_handle_timeout: Timeout avmaster-welcome has occured.
[61-warn] Sun Apr 21 16:53:48 2013 - av_maybe_stuck: Daemon likely stuck. Restart it.
Cannot perform HTTP request. [1c]
[61-err] Sun Apr 21 16:53:49 2013 - avmaster_handle_read: Lost connection to daemon.
[61-warn] Sun Apr 21 16:53:51 2013 - timeout_enable: Timeout avmaster-quit already enabled.
[61-err] Sun Apr 21 16:53:51 2013 - avmaster_handle_timeout: Timeout avmaster-quit has occured.
[61-err] Sun Apr 21 16:53:53 2013 - config_load: ini_read() failed [-1]. Will use defaults.
So I seem to ba able to locate the parts of the logs you suggested we look at, but I have no idea what they may or may not mean.
As a possibly related item, when Chrome was relaoding the tabs the fan in the MacBook Pro ramped up to maximum. I checked the Activity Monitor and found com.avast.MacAvast.MAD had once again gone totally berserk (I opened a ticket on this previously) and was showing over 750% CPU usage of the MBP's 8 cores. I force-quit that process and it is now behaving itself.