Scott,
Very odd! Not being able to load the AWT library from the Java runtime itself is quite peculiar. My first thought would be to install or reinstall a new version of Java or use the -vm argument in the eclipse.ini file to point to an alternate version of Java.
If you are unable to make this work changing Java, in the configuration/config.ini folder, you can turn off the startup experience using genuitec.disable.devstyle.startup=false
— of course if you just want to remove DevStyle again, you can “brick it” by deleting a couple plugins from disk and then you can proceed to use p2 to uninstall it. Simply delete com.genuitec.eclipse.webicons & com.genuitec.eclipse.patches from your plugins area to disable our software from running.
Cheers and hope that helps!
Tim