Yes, the JDK is the same in both plataforms, with a small difference. On Linux is 1.6.0_02 and on Windows is 1.6.0_03. I think this isn't the problem.
This is what I've in webui-jsf-suntheme.jar:
webui-jsf-suntheme\META-INF\services\com.sun.webui.theme.ThemeService
webui-jsf-suntheme\com\sun\webui\jsf\suntheme\[b]SunthemeThemeService.class[/b]
The name of the file isn't the same. But inside com.sun.webui.theme.ThemeService have this text: com.sun.webui.jsf.suntheme.SunthemeThemeService
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