It sounds to me like another procedure is stomping on your variable. Especially since you say the value goes to .F. instead of (Cannot Evaluate Expression) or whatever. Pick a time when oApp shows .F. and do a DISPLAY MEMORY and check what routine initialized your variable.

>First think I did, David. oApp goes to .F. (not "O") the minute the Launcher launches, even before any code is executed....wondering if it's a VFP6 problem?
>
>>
>>Put a debugger breakpoint on oApp and catch the instant it changes.
>>
>>>Hi All ---
>>>
>>>Strange one here. I have an application with a main.prg that has:
>>>
>>>PUBLIC oApp
>>>oApp=NEWOBJECT("appclass","myclasslib")
>>>
>>>The app object sets the environment in Init and then launches a Launcher form, also with NEWOBJECT().
>>>
>>>By the time I get to the Launcher form, oApp is vermicht..hasta la vista...gone...undefined. I can watch it happen yet am clueless why...no CLEAR ALL...no RELEASE ALL or RELEASE oApp.
>>>
>>>What the heck?