Thanks for your report.

I have added this issue to the tracker:
Issue 2319 – After delete operation is moved to background, some operations (notably editing) do not work anymore

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

When I connect to an FTP with WinSCP (latest version). And delete a folder, it does that in the foreground. When I click then, to continue that deletion in the background with the button:

when you can see, that is continues to delete the things in the background:



BUT, If you click in the meantime on any other thing, like to "Edit" a file, it doesn't open the file:


And even after finishing the background job, it doesn't work at all, until complete restart of WinSCP. That only happens if you delete something on the remote site, which takes a while. Only while the deletion process is in the background.

While uploading in the backend, its working ;)
Here is also a video of the issue: https://www.youtube.com/watch?v=quUekq11Uzs