I've got the problem described in https://civicrm.org/blog/totten/mosaico-extension-v20-beta3-etal
The image location is
/files/civicrm/extensions/uk.co.vedaconsulting.mosaico/packages/mosaico/templates/versafix-1/img/social_def/facebook_ok.png
The HTML has it relative to templates
<img src="https://dmo.ecolsoc.org.au/templates/versafix-1/img/social_def/google+_ok.png" alt="Google+" border="0" class="socialIcon" style="border: 0px; display: inline-block; vertical-align: top; padding-bottom: 0px; border-radius: 100%;">
am I missing a .htaccess or extension variable?