Thanks for your report.

Can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.

When a new directory is created in a folder in the background and the file manager window is not refreshed to reflect these changes, pressing shift-del to delete the directory that's highlighted in the window deletes the folder that would be at that position if the window was refreshed, meaning that a different directory gets deleted than was highlighted, leading to catastrophic data loss.