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I'm using Vaadin 6.7.4 to develop portlets deployed on GateIn-3.2.0.Final-jbossas5. I tested my portlets with Chrome 18 and FF 11. Portlets are deployed without any troubles.
I created a portlet with a simple Vaadin Table with headers set up with setVisibleColumns(...) and setColumnHeaders(...) methods. If I try to access my application from it context (localhost:8080/appname), tables headers are displayed correctly. But if I try to access my application as a portlet in GateIn, only the first column header is displayed.
After some investigations, it seems that this problem is caused by in VScrollTable leading to a div with width=900000px in the page. I can't figure out why headers aren't displayed in the portlet whereas they look fine by accessing the application directly.