I'm experiencing exactly the same problem on OSX 10.6.8. Edited to add: Tried to run program as admin sudo Adobe\ Flash\ Builder\ 4.6.app/Contents/MacOS/Adobe\ Flash\ Builder\ 4.6 And got the following to terminal: org.eclipse.m2e.logback.configuration: The org.eclipse.m2e.logback.configuration bundle was activated before the state location was initialized. Will retry after the state location is initialized. org.eclipse.m2e.logback.configuration: Logback config file: /Flash Builder Projects/.metadata/.plugins/org.eclipse.m2e.logback.configuration/logback.1.0.0.20110607-2117.xml org.eclipse.m2e.logback.configuration: Initializing logback org.eclipse.m2e.logback.configuration: eclipse.consoleLog=true !SESSION 2012-06-15 13:34:41.791 ----------------------------------------------- eclipse.buildId=I20100608-0911 java.version=1.6.0_33 java.vendor=Apple Inc. BootLoader constants: OS=macosx, ARCH=x86, WS=cocoa, NL=en_US Framework arguments: -keyring /Users/myusername/.eclipse_keyring -showlocation Command-line arguments: -os macosx -ws cocoa -arch x86 -keyring /Users/myusername/.eclipse_keyring -consoleLog -showlocation !ENTRY org.eclipse.ui 2 0 2012-06-15 13:34:46.628 !MESSAGE Warnings while parsing the commands from the 'org.eclipse.ui.commands' and 'org.eclipse.ui.actionDefinitions' extension points. !SUBENTRY 1 org.eclipse.ui 2 0 2012-06-15 13:34:46.628 !MESSAGE Commands should really have a category: plug-in='com.qnx.flashbuilder.multiplatform.qnx.ui', id='com.qnx.flashbuilder.multiplatform.qnx.ui.commands.OpenInfoCenter', categoryId='com.qnx.flashbuilder.multiplatform.qnx.ui.commands.category.help' !ENTRY org.eclipse.core.net 1 0 2012-06-15 13:34:48.146 !MESSAGE System property http.nonProxyHosts has been set to local|*.local|169.254/16|*.169.254/16 by an external source. This value will be overwritten using the values from the preferences Exception in thread "Thread-1" org.eclipse.swt.SWTException: Invalid thread access at org.eclipse.swt.SWT.error(SWT.java:4282) at org.eclipse.swt.SWT.error(SWT.java:4197) at org.eclipse.swt.SWT.error(SWT.java:4168) at org.eclipse.swt.widgets.Widget.error(Widget.java:774) at org.eclipse.swt.widgets.Widget.dispose(Widget.java:661) at org.eclipse.swt.widgets.Shell.closeWidget(Shell.java:611) at org.eclipse.swt.widgets.Shell.windowWillClose(Shell.java:2261) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5445) at org.eclipse.equinox.launcher.JNIBridge._takedown_splash(Native Method) at org.eclipse.equinox.launcher.JNIBridge.takeDownSplash(JNIBridge.java:167) at org.eclipse.equinox.launcher.Main.takeDownSplash(Main.java:2050) at org.eclipse.equinox.launcher.Main$SplashHandler.run(Main.java:111) Message was edited by: j@rkko
Reinstalling with all preferences removed did not help.
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