This topic explains what to do if no error message is displayed on startup, so GN4 simply disappears from screen after the startup, or it doesn't even appear. If there is an error message displayed, look at Typical error messages on startup. If the application crashes, see GN4 client applications crash. If the application hangs, see GN4 client applications hang.

If no error message is displayed:

•If you are attempting to run GN4 from a ClickOnce launch page, using the browser different than Internet Explorer, and the ClickOnce plug-in is not installed for that browser, the startup will fail. See ClickOnce and browsers different than IE for the instructions. Another reason may be that not all ClickOnce prerequisites are installed. See ClickOnce prerequisites. Another problem may be that the ClickOnce cache got corrupted on your machine. See the cache paragraph in the Troubleshooting and FAQ for ClickOnce topic.

•If you are using a locally installed GN4, create a shortcut to the GN4 application, and then modify it adding the option
/showexceptions.
The procedure is described in Enable exceptions display and logging for GN4 applications. If there's a problem with exceptions, you will see the full exception text. Mail the exception to the support desk. If there's no exception displayed, read other points of this topic.

See also the "Client applications e.g. Ted4 or Fred4 may crash at startup..." condition in GN4 may crash when...

•Either if you are using ClickOnce launcher, or attempting to launch GN4 from the local disk, and startup fails, the possible reason might be that the GN4 installation or upgrade failed at some point, and you didn't notice it. Contact your Systems Administrator, or repeat the GN4 installation or upgrade on all the related servers. If you performed an upgrade, before extracting program files from the ZIP, start the Windows Task Manager and make sure that no GN4 application or service is active in memory. Have in mind that sometimes, after silent crashes, an application may remain active in the memory but invisible. Such "ghost" applications prevent upgrades. Use the End Task command in the Task Manager, to close GN4 "ghost" applications before extracting program files from the ZIP.

•It is possible that computer's memory is messed up - reboot the machine and then retry.

If there's an error message displayed:

•Read the error message and check if it's the one of the messages listed in Typical error messages on startup.

•If the message is related to a crash or exception, look in GN4 may crash when...

•Check if you are connected to the network, and to the Web server. If you are using a test bed on a stand-alone GN4 client/server computer, check if the IIS and SQL server are started and working correctly. Check if the Web site is started.