Am using version Csound 5.06 (float samples) July 1 2007 installed from the Csound5.06-win32-f.exe package, on an intel P4 under XP. OPCODEDIR is set to C:\Program Files\Csound\plugins. PATH includes the ..\Csound directory. Blue operates this well. But when using the XP commandline (start, run.., cmd), I notice "segmentation violation" reported after each progam ends; Csound tidy up: Segmentation Violation This is reported for Csound, pvanal, lpanal, csound -U pvanal, etc. The Csound5 gui ends with a popup error reported. With pvanal, a pvx file is reported as generated, but pvoc is unable to open it. Am something of a novice on XP, so any comments or suggestions much appreciated.