Customer has a native Dialog System application that displays a window on which an ActiveX control resides.
This native application displays this Dialog System window and then calls a managed code .Net WinForm application that displays a Windows Form which also has an ActiveX control on it.
When the program does this it gets the following exception:
Application Exception A device attached to the system is not functioning.
What is causing this to occur?
Try setting the following environment variable in your computers environment
This is a problem that is caused by the Micro Focus native OLE support calling CoInitialize on a thread that it did not own, mainly the managed code thread.
If this environment variable is set the OLE support will not try to initialize a thread that it does not own.