Dialog Box does not function when called a second time

[holmans]

I have created a dialog box that only seems to work once in a larger application. The box is designed to be a MatLab code debugger. My idea was to allow a user to interactively create/debug Matlab code from LabView using ActiveX automation. Anyway, I have created a test vi that uses this dialog box twice. The first time it is called it functions as expected, but the second time nothing on the front panel (of the dialog box) responds and I cannot close the window or interrupt the vi. I am using LabVIEW 7.0 on Windows 98. Please see the attached vi's. MatlabDebugger.vi is the dialog that's causing the problem. Matlabx2.vi is the sub vi that handles the ActiveX automation. Debuggertest.vi is the test v
i in which the dialog will not word a second time.

Thanks in advance for any help or suggestions.

[Mads]

The problem is caused by the nested event structures; you have an event structure inside an event structure, acting on the same controls. When the main one reacts to the cancel the other one get's stuck...so on the next call the main event structure just halts due to the stuck event structure inside it. It's not obvious why this is a fault, you may be able to spot it now that you're on the track though.