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Aug 14, 2015 7:50 AM in response to gruchaby Antonio Carmona,Maybe this helps someone.
I have the same issue on a MBP 13" of late 2011, bought in May 2012, which originally came with OS X Lion, and has been working together with a Thunderbolt Display bought at the same time, with no issues for +3 years. Right after recently updating to Mountain Lion the blinking problem started on the Thunderbolt display.
Something that works with me is (strange but true), when I got the blinking on the Thunderbolt Display, I put the Mac to sleep and right after wake it up (both sleep and wake with the display connected), and the blinking issue disappear until the next reboot.