1) Lightroom 5 creating virtual copies
The Lightroom plug-in API has a bug. This makes that the behavior of the "Create Virtual copy" function in some views does not work correct. (Library-Grid, Library-Loupe and Develop).
The bug is: when multiple photos are selected and Virtual copies should be made that in some views (Library-Grid, Library-Loupe and Develop) only 1 virtual copy is created and not for all. This bug has been reported.
To help you determine in which views the "create virtual copy" functionality runs fine an extra test program is added, see "Test Virtual copy" in the plug-in menu.
How to run the test?
Select between 2 and 10 photos and run the test in all the three views"Library-Loupe, Library Grid and Develop module.
Please run the plug-in in the view that works fine for you.
2) Synchronization problem in the Lightroom API
When applying Auto-tone the Lightroom API (Application programming interface) will not always report the correct values directly for the sliders in the Basic panel, like Exposure, Contrast, Highlight, Shadows etc. It might wait until it has generated all its previews. In that case reports a value of -999999 when you run this plug-in before it has finished. This report has been filed with Adobe.