Latest WLK, I'm having some issues with machines that appear and disappear from the controller. The logs have some errors such as: 1844 1952 2008:6:15 15:39:32:968 Error: 0x80040e14, Error 0x80040e14 (Error hr: 80040E14 (-2147217900) from call: pADOCommand->Execute (NULL, NULL, 0, &pADORecordset) ) File=d:\3360\sdktools\wtt\jobs\runtime\common\db\src\wttdbaccess.cpp Line=1221 WINXP-VM13->CONTROLLER: 1844 1952 2008:6:15 15:39:32:968 Error: 0x80040e14, Error 0x80040e14 CMGMachineIDMessageHandler:Unable to Execute Query:"EXEC [dbo].IdentifyResource_SP N'', ... Is it some database corruption? The machines are VERY similar to one another - what makes a machine unique to the controller (I suspect a combination of several attributes, just not sure which).