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Randy OttRandy Ott 

Developer console not displaying

In my sandbox, the developer console won't display. It opens up a window, immediately resizes to a very small window and hangs.  Chrome eventually times out and I have to kill the session.  I can pull up the console in my production account.
Try this and check your Chrome settings:  Advanced Settings, Privacy, click Content button, scroll down to Popup section.  Make sure 'Allow all sites to show Popups' is checked.