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Occurs on build 200905220201 with JDK7b57. Also reproduced on Ubuntu with JDK6. When launching IDE via CLI with parameter --open $PATH_TO_DIRECTORY, IDE is launched, no message or whatever is shown, just a blank tab with no header&content is opened next to Services tab.
Anything in messages.log? Is it reproducible (with clean userdir)?
*** This issue has been marked as a duplicate of 166835 ***