Random IllegalArgumentException at application startup

I recently upgraded to GWT 2.6.1 and I see errors like below randomly at startup in DevMode.  I saw this issue before the upgrade but it seems worse now.  It does not happen all the time, it seems to occur when there is a delay in the DevMode starting.

E.g. I will see this in the console... 

Dev Mode initialized. Startup URL: 

http://127.0.0.1:8888/index.html?gwt.codesvr=127.0.0.1:9997

...and then there is a very long pause before 'Debug enabled' appears in the console.  During this time the browser gives the busy/non-responding feedback and often will display the browser hung dialog box to which I select the continue option.  I'm using Firefox 24.2 and have been for some time as that works with DevMode.  This behavior does not happen all the time and I have not been able to determine what/when it will occur but it seems to occur more often now with 2.6.1.

SEVERE: Something other than a Java object was returned from JSNI method '@com.google.gwt.user.client.ui.PotentialElement::resolve()': JS value of type int, expected java.lang.Object

java.lang.IllegalArgumentException: Something other than a Java object was returned from JSNI method '@com.google.gwt.user.client.ui.PotentialElement::resolve()': JS value of type int, expected java.lang.Object: at

com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:178)

com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:286)

com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)

com.google.gwt.user.client.ui.PotentialElement$.resolve$(PotentialElement.java)

com.google.gwt.user.client.ui.PotentialElement$.resolve(PotentialElement.java:112)

com.google.gwt.user.client.DOM.insertChild(DOM.java:1224)

com.sencha.gxt.core.client.dom.XElement$.insertChild$(XElement.java:1357)

com.sencha.gxt.widget.core.client.container.Container.doPhysicalAttach(Container.java:321)

com.sencha.gxt.widget.core.client.container.Container.insert(Container.java:395)

com.sencha.gxt.widget.core.client.container.SimpleContainer.setWidget(SimpleContainer.java:109)

com.sencha.gxt.widget.core.client.container.SimpleContainer.add(SimpleContainer.java:56)

-Dave

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