>>>>Does any control have TabStop property set to false ?
>>>
>>>Yes - I have some several fields set this way (command buttons, etc.)
>>
>>Could it be related to your problem? Copy this not working form and on the copy make all controls TabStop property set to true (or should it be false?) and re-test.
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>
>That doesn't seem to work either. For what it's worth, when I tab off a field, it is executing the lostfocus logic.

It should - that's OK. Do you have anything in LostFocus preventing the focus to move (NODEFAULT) ?