Quantyfier Pro: Main dialoge box does not appear

Extensions
2

Try this:

Follow this guide exactly after opening the dialog in a question and you not see it

  1. Hold down the ALT key. Hit SPACEBAR.
  2. Release ALT key
  3. Hit M (Move).
  4. Hit one of ← ↑ → ↓ arrow keys
  5. Move your mouse around (without pressing any mouse key) until you see the missing window.
  6. Press left mouse button on the desired place

( Note I assume you have English windows otherwise you may need to replace “M” with a localized letter for move, e.g. “L” in French)
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An other workaround can be (This will bring all HtmlDialog to the center of model window):