User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:220.127.116.11) Gecko/2009042316 Firefox/3.0.10 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:18.104.22.168) Gecko/2009042316 Firefox/3.0.10 This problem occurs for Constant Contact emails. Also, displays are extremely wide for emails grouped in a single Gmail conversation. This problem does not occur with IE7, either. Reproducible: Always I will be happy to send you a test case from Constant Contact. As I indicated above, it happens every time, and the displays correct themselves when I change align="middle" to align="center" in the HTML.