The White Screen indicates that the Operating System shut the Program down. There should be a Report. If you contact Support with the details, we may be able to tell you what is happening..

Note: the clicking twice will sometimes cause the OS to think something is wrong, Poser was most likely doing the delete (creating the undo) after the first click and the second click led to the OS shutting the program down. You may need to remove your Prefences if this happens to prevent the issue from being encountered again and again.

Some things to try if this does happen is check your undo count in Preferences. Pay attention if it is specific content or if the figure has specific morphs added. I encountered a Prop that had an error, that left some ghosts when you deleted. This prop would sometimes crash Poser when deleting. I suspect because of the data that got left behind. The Vendor fixed the item once it was discovered and they were notified.

ratscloset
aka John