I've already backported my changes to 6.0.x, but building locally kie-wb today (Monday Morning UK time) I'm still getting issues with the designer. It could compile ok, but there are still some issues when closing it:
[ERROR] com.google.gwt.core.client.JavaScriptException: (TypeError) @org.jboss.errai.ioc.client.BootstrapperImpl::_$1757102468_onWorkbenchPartBeforeClose(Lorg/uberfire/client/mvp/PlaceManagerImpl;Lorg/uberfire/workbench/events/BeforeClosePlaceEvent;)([Java object: org.uberfire.client.mvp.PlaceManagerImpl@1857744690, Java object: org.uberfire.workbench.events.BeforeClosePlaceEvent@2003088368]): $wnd.document.getElementById(...).contentWindow.ORYX is undefined
[ERROR] at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:249)
[ERROR] at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
[ERROR] at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)
[ERROR] at com.google.gwt.dev.shell.ModuleSpace.invokeNativeVoid(ModuleSpace.java:299)
[ERROR] at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeVoid(JavaScriptHost.java:107)
[ERROR] at org.jboss.errai.ioc.client.BootstrapperImpl._$1757102468_onWorkbenchPartBeforeClose(BootstrapperImpl.java)
[ERROR] at org.jboss.errai.ioc.client.BootstrapperImpl$132$1.fireEvent(BootstrapperImpl.java:2661)
[ERROR] at org.jboss.errai.ioc.client.BootstrapperImpl$132$1.fireEvent(BootstrapperImpl.java:1)
To reproduce this issue:
1) start kie-wb
2) go to Authoring
3) select a business process from one of the projects, and wait for the desiger to open
4) Switch to Process Definitions Perspective or any other perspective
I'm adding Tihomir to the thread, because I know that this looks like an UF error as well.