Collapse Tool Above Panel Heading

[papajohn]

When I deploy my app with Tomcat on an Amazon instance, I'm getting a formatting problem when viewing with Firefox: the collapse button is appearing left justified above the panel heading, like this:

http://www.eecs.berkeley.edu/~denero/collapse_broken.jpg

Oddly, this formatting issue doesn't arise when I develop locally (in GWT browser or Firefox after a compile), or in Safari. I'm developing on a mac and deploying on an Amazon Linux image.

Has anyone seen this before? Not sure if it's a ext-gwt bug or some quirky interaction.

Thanks in advance,
John