client logging config help with unexpected popup

I'm using client logging and have been for a while.  Things worked fine in 2.6 but when I switched to 2.7 I got a few logging config errors as handlers were no longer supported.  After correcting these and opening my app in a browser I get a white popup window in the upper left (looks like this http://imgur.com/Xavu6K7).  Strangely, this only shows up when building and running on linux; when running on a mac the popup never appears.

The relevant parts of module file looks like this:

<inherits name="com.google.gwt.logging.Logging"/>


<set-property name="gwt.logging.logLevel" value="CONFIG"/>

<set-property name="gwt.logging.enabled" value="TRUE" />

<set-property name="gwt.logging.consoleHandler" value="ENABLED" />

<set-property name="gwt.logging.developmentModeHandler" value="DISABLED" />

<set-property name="gwt.logging.hasWidgetsHandler" value="DISABLED" />

<set-property name="gwt.logging.systemHandler" value="DISABLED" />

<set-property name="gwt.logging.simpleRemoteHandler" value="DISABLED" />

Basically, all I want is the console handler as I'm doing everything else with a custom handler (it's silly these aren't disabled by default).  My custom handler extends Handler and is pretty simple.  It is created like this:

Logger.getLogger().addHandler(new CustomHandler());

And I'm sure the white popup isn't coming from there.  So what's going on?  And isn't this some sort of GWT defect if things behave differently on different platforms using identical codebases?

Thanks for the help!

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