This is a minor issue to be sure.
Run web console and navigate to Monitoring - Web Status - Connector scoreboard in the left frame. The right frame displays the Tomcat status, but it does not include the JBoss logo on the top and it does not use the JBoss style sheet.
Navigating to Monitoring - Web Status - Full status also shows the same problem.
When accessing the same Tomcat status pages from the main page (e.g., http://localhost:8080), this problem does not occur.
It appears that logo.gif and jboss.css are located in the "root" directory for Tomcat. However, for the web console, logo.gif is located in the "images" subdirectory and jboss.css is located in the "css" subdirectory, so they are not found when using the web console.
An easy workaround is to copy the files logo.gif and jboss.css into the directory deploy/management/console-mgr.sar/web-console.war.