Mike, the resolution to Brett Richardson's problem is of interest to me. My problem is different to Brett's in that it did not arise with migration to Windows 2000 from another operating system. I have been creating successful executables from the 5.0, then the 6.0 LV development environments since 2001. The executable resulting from a recent edit of one program causes Windows 2000 to close it down. The executable opens successfully, but every time I click on a front panel control button, Windows crashes the executable. The DR Watson error log entry describes the fault as: "The application, GTL Noise Fig v5.07, generated an application error. The error occurred on 07/25/2003 @ 09:39:18.039 The exception generated was c0000005 (access violation
) at address 30164426 (IsValidTag)" SEE ATTACHMENT. When in the 6.0 development environment, the same control button causes no problem, and the vis linked to the button open normally.