>Hi
>
>Apart from the obvious, can anyone tell me the exact reasons for this error message, and possible work arounds. We find that even after releasing all the application objects, that attempting to open some windows, including native fox windows, still generates the error message.
>
>Any information to help us nail this down would be great.
>
>Thanks in advance.
>
>Mace

Hi Macer
Maybe every form you are opening and closing remains active in memory for some reason, and so you finally run out of HWND window handlers.
That may happen even if you release the external references to those forms (the "application objects" you mention)
Check these issues:

How do you end your forms (Hide? Release?)

Circular references -passing around form references to other objects/forms-

Hope this helps,