Hi propiro,

re:

script:
/* Duplicate selected objects */
var gd = moi.geometryDatabase;
var objs = gd.getSelectedObjects();
if ( objs.length != 0 ) gd.copyToClipboard( objs );
moi.command.execCommand( 'paste' );
objs =gd.getSelectedObjects();
if ( objs.length != 0 ) moi.command.execCommand( 'Move' );

The problem is that execCommand is not synchronous, so as to avoid one command from running while still inside another one.

So execCommand sets some flags and then the command is only actually launched when on a clean call stack.

But instead of using execCommand( 'paste' ) you can use the direct script code for what the Paste.js command does internally which is:

moi.geometryDatabase.pasteFromClipboard();

There are also some other already existing ways to duplicate objects similar to this - the Transform > Copy command or also holding down the Ctrl key when you click and drag on an object will drag off a duplicate.

- Michael