Fix webdriver heisenbug at login after project creation

org.openqa.selenium.NoSuchElementException: Unable to locate element: {"method":"id","selector":"gwt-debug-loginDlgUsername"}
Command duration or timeout: 22 milliseconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '2.31.0', revision: '1bd294d185a80fa4206dfeab80ba773c04ac33c0', time: '2013-02-27 13:51:26'
System info: os.name: 'Linux', os.arch: 'i386', os.version: '2.6.32-46-generic-pae', java.version: '1.7.0_09'
Session ID: e50483dc-c9fd-487a-9d40-050c409c1d22
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{platform=LINUX, acceptSslCerts=true, javascriptEnabled=true, cssSelectorsEnabled=true, browserName=firefox, handlesAlerts=true, nativeEvents=false, webStorageEnabled=true, rotatable=false, locationContextEnabled=true, applicationCacheEnabled=true, takesScreenshot=true, version=3.6.28}]
	at sun.reflect.GeneratedConstructorAccessor56.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
	at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:187)
	at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:554)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:307)
	at org.openqa.selenium.remote.RemoteWebDriver.findElementById(RemoteWebDriver.java:348)
	at org.openqa.selenium.By$ById.findElement(By.java:216)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:299)
	at org.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement(DefaultElementLocator.java:59)
	at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:34)
	at $Proxy48.clear(Unknown Source)
	at com.nuxeo.studio.test.web.pages.dialogs.StudioLoginDialog.login(StudioLoginDialog.java:49)
	at com.nuxeo.studio.test.replay.ProjectReplay.createProject(ProjectReplay.java:76)
	at com.nuxeo.studio.test.replay.ProjectReplay.replay(ProjectReplay.java:62)
	at com.nuxeo.studio.test.integration.StudioReplayITCase.testReplay(StudioReplayI