Hi Chris,
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This issue is normally related to Window Frames which can have the "Always on Top" property set.
The JMRI System Console is a handy Frame in this regard to test Dialogs with / behind.
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Unfortunately it's a bit of a whack-a-mole, we can't add a blanket solution for this as dialog boxes could well attach to the the incorrect window in too many cases, causing further confusion.
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See comments within for a bit of a technical explanation ( Window Modality ).
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I can re-produce with the About Dialog, will upload a fix in due course.
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Could you please provide some text within the LogixNG Dialog which is causing issues?
There are a fair few Dialogs ( 2000+ in JMRI ), so it would be good to try and identify the correct one!
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Thanks for reporting,
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Steve.
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Steve Young,
Member JMRI Dev Team