I've just added some code (ready for Inverse Gaussian distribution in preparation for Boost.Math). When I added one new section of kosher-looking C++ code, I started to see memory leaks reported: For example: *** No errors detected Detected memory leaks! Dumping objects -> {3485} normal block at 0x003611B0, 42 bytes long. Data: <class boost::mat> 63 6C 61 73 73 20 62 6F 6F 73 74 3A 3A 6D 61 74 {3484} normal block at 0x003635A0, 8 bytes long. Data: < 6 46 > B0 11 36 00 F8 34 36 00 ... But no filename is given as promised by http://msdn.microsoft.com/en-us/library/e5ewb1h3%28v=VS.80%29.aspx So I'm puzzled if/where I should look for a problem. (occurs for both debug and release) Or is this spurious? Should I just suppress the warnings? Paul --- Paul A. Bristow, Prizet Farmhouse, Kendal LA8 8AB UK +44 1539 561830 07714330204 pbristow@hetp.u-net.com