jQuery dialog z-index problem after migrating to APEX 5

After migrating an APEX 4 application to APEX 5.0.2 I got an issue with the plugin called "Dialog Region".


The modal dialog wasn't accessible because the overlay effect was on top of my dialog.

Luckily some CSS code fixed the issue:

body div.ui-widget-overlay {
    z-index: 1;
}

The issue comes from the plugin in combination with an old theme. Actually it is easy to fix and no reason not to upgrade to APEX 5.0.2. :)

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Btw.: The return to page function don't work in the "edit page" view.