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stm32l-discovery weird blinking on LD1

Question asked by shan on Mar 12, 2014
Latest reply on Mar 13, 2014 by Clive One
Hi all,

I have a question regarding to LD1 COM LED of STM32L Discovery board.

From UM1079, it mentioned LD1 COM turns green to indicate that communications are in progress between the PC and the ST-LINK/V2.  And normally it should be a red as default status.  However, what does the blinking red indicate?

With the same code, I saw this situation sometimes, but sometimes it just works fine.  I always need to plug and unplug my USB cable until it functions normally......  Does anyone have any idea?  
Could it be caused by the insufficient current of my USB hub? Otherwise I couldn't think of a reasonable answer.