Highlighting of errors in the editor is suddenly missing

[danrubel]

[user feedback]
Highlighting of errors in the editor is suddenly missing.
////////////////////////////////////////////////////////////////////////////////////
Editor Version: 7905
////////////////////////////////////////////////////////////////////////////////////
OS: Mac OS X - x86_64 (10.7.4)
SDK installed = true
Dartium installed = true
AnalysisServer enabled = true
////////////////////////////////////////////////////////////////////////////////////

!SESSION 2012-05-27 14:44:28.612 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.6.0_31
java.vendor=Apple Inc.
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US
Framework arguments: -keyring ${user.home}/.eclipse_keyring -showlocation
Command-line arguments: -os macosx -ws cocoa -arch x86_64 -consoleLog -data ../../../workspace -keyring ${user.home}/.eclipse_keyring -showlocation

!ENTRY org.eclipse.ui 4 0 2012-05-27 14:53:56.549
!MESSAGE Unhandled event loop exception
!STACK 0
org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException)
       at org.eclipse.swt.SWT.error(SWT.java:4282)
       at org.eclipse.swt.SWT.error(SWT.java:4197)
       at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:138)
       at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3935)
       at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3612)
       at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
       at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
       at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
       at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
       at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
       at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
       at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
       at com.google.dart.tools.deploy.DartIDEApplication.start(DartIDEApplication.java:41)
       at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
       at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
       at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
       at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
       at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:597)
       at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
       at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
       at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
Caused by: java.lang.NullPointerException
       at com.google.dart.tools.ui.console.DartConsoleManager$1.run(DartConsoleManager.java:111)
       at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
       at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
       ... 22 more

[scheglov]

Works for me.
May be just Tools | Re-Analyse Sources should be used.

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Added CannotReproduce label.