I'm sorry to hear that your email looks different when you send it out as a live email. Display issues can vary due to specific email clients. What email client are you using? If you still need help, let us know!
I am sorry to hear this happened. Unfortunatelyevery email client reads the email a little differently so we suggest testing in multiple clients and browsers to see how it looks. What email client did you send the test to? Can you tell me more about what looks different in the live copy?
re: "so we suggest testing in multiple browsers"
That can be misleading. You mean to say multiple browsers AND multiple email clients AND as many versions of OutLook as you can afford.
The preview tool is not a 100% reliable method of ensuring that your piece will be presented well in all email clients or the worst challenge Microsoft Outlook".
If you wish help with tweaking your piece drop me a PM here. I provide that sort of support service.
I see you were able to get in touch with support for help with this. It looks like our second level of support recommended switching back to the regular editor and using tables to hold the content in place. Have you been able to test this out?