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Problem:

When you open a dialog box the dialog box will disappear.  The problem is the dialog box is still opened somewhere and is waiting for input.

Solution:

If you Right Mouse Button (RMB) over the desktop you can select "nView Properties", which brings up a dialog box for "nView Desktop Manager".

Select the "Windows" tab. 

 Window control:

      Prevent windows from opening off-screen": ENABLE (checked)

 Dialog box repositioning:

      Reposition dialog boxes on: Move to application display

      Center dialog box on display: ENABLE (checked)

Suggested Answer: RE: Dialog Boxes Off Screen by Johannes Michalowsky

Many Thanks,

Also, please delete all files with content  *wnd* (Wnd=Window)., when it happens, in

For Power ProStructures (V8i)

Drivename:\Program Files\Bentley\ProStructures\V8i_S6\AutoCAD 201x\Localised\Country setting you used\Temp\Metric 

For Prostructures on Microstation its in

Drivename of installation:\ProgramData\Bentley\ProStructures V8i S8\WorkSpace\ProStructures\Localised\Country setting you used\Temp\Metric

For Prostructures CONNECT Edition its in

Drivename of installation:\Users\<User name>\AppData\Local\Bentley\ProStructures\10.0.0\prefs\Personal_WndCfg

That sets all dialog to default position, as those files store the dialog positions.

It´s mostly needed to delete these files when you switch monitors or resolution.

Or use some extra downloadable Tools, there is a tool include that resets all dialogs to default position.

http://communities.bentley.com/products/structural/drafting___detailing/m/drafting_and_detailing_gallery/267785