rajaratk wrote: Expression: nLength <= GetData() -> nAllocLength From here you should be able to look at the stack frame to see how code execution got to line 877. It looks to be a string-related object. "A good athlete is the result of a good and worthy opponent." - David Crow "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

As David says, this makes no sense on its own. Are you confusing Close / Open with Minimise / Maximise? If not, then some action in your code is doing different things. Do you save values? Do a search in your code for the control ID of the spinbutton and see what you do with it. Unless someone (ie, YOU) disables the control, it will be at whatever state it is set to be in the dialog resource. You need to track down where you disable it, and see why that is different in the two scenarios. Iain.

So you are getting values changed... class C_User : public CObject, public user class C_Subscriber : public C_User typedef struct user far *LPUSER C_Subscriber subdeviceSubs = *lpSubscr; So the C_Subscriber has CObject in the first memory area. I doubt that it could be the problem. Dont you get any compilation error by "C_Subscriber subdeviceSubs = *lpSubscr;" ? - NS -

jhwurmbach wrote: My brain-internal search&replace put 'get' in place of the 'use' you had written! Damned multithreading...:laugh::laugh: Russell