Eu estou tentando automatizar os casos de teste usando webdriver de selênio, junit e ant build. Estou recebendo erros estranhos desde a manhã. Um caso de teste contém o comando button click. O teste é executado com sucesso no Chrome e no FF, mas não no IE. Anteriormente, era pelo menos dizendo que incapaz de encontrar algum elemento X, mas este diz que o servidor não forneceu nenhuma informação.

Testcase: testMethod took 10.342 sec
    Caused an ERROR
Cannot click on element (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 172 milliseconds
Build info: version: '2.23.1', revision: '17143', time: '2012-06-08 18:59:04'
System info: os.name: 'Windows 7', os.arch: 'x86', os.version: '6.1', java.version: '1.6.0_33'
Driver info: driver.version: RemoteWebDriver
Session ID: 8dfc5072-2755-40a7-bb32-05708c51101f
com.thoughtworks.selenium.SeleniumException: Cannot click on element (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 172 milliseconds
Build info: version: '2.23.1', revision: '17143', time: '2012-06-08 18:59:04'
System info: os.name: 'Windows 7', os.arch: 'x86', os.version: '6.1', java.version: '1.6.0_33'
Driver info: driver.version: RemoteWebDriver
Session ID: 8dfc5072-2755-40a7-bb32-05708c51101f
    at org.openqa.selenium.internal.seleniumemulation.SeleneseCommand.apply(SeleneseCommand.java:41)
    at org.openqa.selenium.internal.seleniumemulation.Timer.run(Timer.java:38)
    at org.openqa.selenium.WebDriverCommandProcessor.execute(WebDriverCommandProcessor.java:144)
    at org.openqa.selenium.WebDriverCommandProcessor.doCommand(WebDriverCommandProcessor.java:74)
    at com.thoughtworks.selenium.DefaultSelenium.click(DefaultSelenium.java:193)
    at dmswebui.IE.TestLogin.testMethod(TestLogin.java:19)
Caused by: org.openqa.selenium.ElementNotVisibleException: Cannot click on element (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 172 milliseconds
Build info: version: '2.23.1', revision: '17143', time: '2012-06-08 18:59:04'
System info: os.name: 'Windows 7', os.arch: 'x86', os.version: '6.1', java.version: '1.6.0_33'
Driver info: driver.version: RemoteWebDriver
Session ID: 8dfc5072-2755-40a7-bb32-05708c51101f
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:188)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:458)
    at org.openqa.selenium.remote.RemoteWebElement.execute(RemoteWebElement.java:244)
    at org.openqa.selenium.remote.RemoteWebElement.click(RemoteWebElement.java:77)
    at org.openqa.selenium.internal.seleniumemulation.Click.handleSeleneseCommand(Click.java:36)
    at org.openqa.selenium.internal.seleniumemulation.Click.handleSeleneseCommand(Click.java:1)
    at org.openqa.selenium.internal.seleniumemulation.SeleneseCommand.apply(SeleneseCommand.java:32)