Hi Phil, Attached is the model file. I try to create the exchange using “Lucky Peak LUC to LuckyToGlenwood gain Stored” for the borrow supply and “Anderson Ranch ANDactiveAccrual to Arrowrock Locals Gain ANDonARK” for the Payback source. When I set those two and click apply, RiverWare crashes. I have not tried this for other supplies. If it helps, I am running this on a Windows 7 machine with the 64 bit version. Thanks! Jennifer Borrow Supply: “Lucky Peak LUC to LuckyToGlenwood gain Stored” Payback Source: “Anderson Ranch ANDactiveAccrual to Arrowrock Locals Gain ANDonARK” Unhandled exception at 0x000000013f91fff9 in riverware.exe: 0xC00000FD: Stack overflow.