Go to http://www.emclient.com/release-history and download version 30508. Version 30068 was problematic and eventually pulled by eM Client. I know, it should show the update in eM Client, but it dies not. Hopefully this will fix the issue.
Please check in http://www.emclient.com/release-history that you have the newest version of eM Client.
Then go to Menu > Tools > Accounts and delete the account. Then add the account again in the same path.