Can anyone confirm this crash please?
Open WeBuilder (latest version). Make sure the File Explorer is open and displayed.
Set File Explorer view to Tree View
Try to drill down below the level of the current project by clicking the 'up one level' folder icon (highlighted in screenshot).
If I try to go beyond the 'My Web Sites' folder by clicking twice on the 'up one level icon', boom! Crash with option to send bug report, which I have done.
Anyone else?

Cheers
Dave