Not on coinroll, but I lost 6 in a row on 87.7779%, on JD, after about 842,000 rolls. I'm expecting to lose another 6 times in a row in about half the number of rolls now.
I'm quoting myself, but my expectation came true, about 2 weeks ago. I lost another 6 times in a row. I made a post about it in the JD thread and people are going nuts over the discussion, not just about the sequence, but that I was "selling" the 7th bet. (which I have not yet done.)