What could make a JOptionPane visible but not showing?

Hello,
I use FEST-swing to implement automated validation tests of a GUI application.
At one point the conversation being tested involves a modal dialog implemented using one of JOptionPane.showXxxDialog(...) methods.
When I automate cancelling the dialog (clicking the cancel button), I also check that the dismissed dialog is now hiding (FEST's dialogFixture.requiresNotVisible() , which in the end calls theDialog.isVisible() ).
My problem is that sometimes (I haven't identified any correlation so far), the dialog is still visible ( isVisible==true ), which fails my test, whereas on eye-witness inspection, the dialog is indeed not shown on the screen, and on code-tracing, it is not showing ( showing==false ).
- One trail to investigate could be improper usage of the EDT, but FEST-swing is supposed to issue Fixture checks on the EDT. I'll report that to the apporpriate mailing list.
- Another trail is, do you see a reason why the JOptionPane's dialog, could have visible=true and showing=false?
I'm sorry, I cannot produce an SSCCE (it works in simpler cases, plus it would require using the FEST-swing library).
Thanks in advance, and regards.
J.

I should add that I use a something.waitForIdle() method in the testing lib API that supposedly wait until there are no more event in the EDT, and I also put manual Thread sleeps to let stuff happen. So I don't think it's related to e.g. the "bringing down" not having finished to processed when I check the visibility. But of course, you are encouraged to question my assumptions :o)

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