Flat at roughly unchanged levels out of the gate, then MBS tanked (moderately) and Treasuries tanked modestly.  A portion of that weakness has been recovered in MBS, but Treasuries remain near higher yields.

Treasuries jumping in with some gains of their own now at the end of European trading hours (little else to pin it on besides the change in cash flow between trading sessions). MBS are holding unchanged levels.  Stocks are at the highs of the day, but not yet back to overnight highs.

MBS at the best levels of the day now, up 3 ticks (0.09) as 10yr yields plod back toward the day's lows.  All this despite stocks doing fairly well.  No specific market mover driving the action.  Money is just flowing in on the first day of the month (and it doesn't take much considering the narrow range and limited liquidity in MBS).