If you updated EasySocial, then the logo gets overridden again. Did you create an email logo override in your template folder?
See this older post for a guided tutorial
Guide: Randall - ChamberAnswers.com
Guide Number: #004 of 5 lessons
Released: Thursday, March 13, 2014
Category: EasySocial > Templating
Level: Beginner EasySocial Administrator
Overview of Video Class: CUSTOMIZING THE EMAIL LOGO IN EASYSOCIAL - How to change the email branded logo in emails sent out to users from EasySocial
You will find a few video guided tutorials on this page and the one you are looking for to create an email logo override is down the page a few reply posts.
http://stackideas.com/forums/what-did-you-learn-about-easysocial-today-learn-share-repeat
Hope this helps.
Randall