ColinW

I've been seeing this for some time as well, the only time I wouldn't want them to stay where they were left is if it was reopened on a single monitor setup

I export stl files from VW and import into Meshmixer to check before printing, it's a Mac and Windows app which is free and popular with the 3D printing community for repairing stl files, mixing stls together and modifying them. It's was acquired by Autodesk who seem to be taking it's underlying technology and adding it to fusion360, but it is still free and still one of the go to apps, search youtube for videos showing how to repair stls if you want to find out more about it, I found the Makers Muse Youtube channel very accessible.

Dom, I opened your file on a MacBook Pro (15" Mid 2010)/Sierra 10.12.5, I could alter the length and width of the PIOs in the Info Pallet and it worked. Double clicked the PIO to view the marionette script and closed again, took about 20 seconds to close, but everything worked. Regards Colin