>I actually went in to a "form table" once when I had the problem, and I found ZOrderSet everywhere... What does that thing do?

Nothing useful. Your best bet is to remove it when it's there. Here's some of what we said in HackFox:

---begin HackFox excerpt
So who cares, right? Unfortunately, the presence of ZOrderSet can make it difficult to reorganize a form or class. When an object has a ZOrderSet assignment, it may be impossible to have Bring to Front and Send to Back assignments stick, or newly added objects may land in the wrong position Z-wise. The solution: Open the form or class as a table, and root out all assignments to ZOrderSet.
---end HackFox excerpt

Tamar
>
>>>I have a problem, which has been in VFP 6 and 7 and it makes you go crazy when it appears...
>>>
>>>I have a shape around almost all my object, but from time to time, this shape object decieds for itself that it has to be on top of everything, no matter how you try to "Send to back". Well, when you do the send to back, it looks ok, you save the form and exit... But when you open the form again... The shape is still there, on top of everything... The only thing you can do, is to remove all object that the shape hides and recreate them. SO ANNOYING... Is this a known bug, or does it only happends to me? Anyone who knows a better workaround?
>>
>>Just a guess, but open the form as a table, and see whether the pseudo-property ZOrderSet appears anywhere. If it does, remove it.
>>
>>Tamar