New data is out on the TSP FTRIB electronic reading room.
...the first glance shows they did a special "fair valuation" on Janaury 31 and again on February 29th, and clipped money from those who were trading that day, turning almost a million dollars in profits from those who bailed out, and missing the index by 211 basis points in the process. The FV clipping allowed Barclays to steal almost a million dollars from you- $969,796 to be exact, making the numbers show that trading in the I fund GAINED for those who remained in the fund an extra $969,796 profit. That's right- the I fund trading costs were NEGATIVE for the month- but the index itself missed by 211 basis points in the process.