Hi guys, I've just learned that it's not necessary to do GWT compilation for *all browsers* in order to debug given oVirt Frontend application (WebAdmin or UserPortal). Full oVirt build & deploy to Engine is still recommended, but you can use "gwt.userAgent" property to restrict GWT compilation only for a couple of browsers: $ mvn clean install -Pdep,gwt-admin,gwt-user -Dgwt.userAgent=gecko1_8,ie8 The example above means "compile only for Firefox and IE8". I suspect it's because of GWT permutation selector script (*.nocache.js) being optimized-out in case you perform compilation for a single browser, which might interfere with the way how GWT plugin connects to Development Mode. Regards, Vojtech