Version:            (using Devel)
Compiler:          g++ 4.3 
OS:                Linux
Installed from:    Compiled sources

1. konsole
2. echo "test text" > ~/blah.txt
3. dolphin ~/
4. select the file blah.txt and "shift+click" to delete the item directly instead of moving it to trash.

Now there is a notification in the notification widget (showing jobs 0/1) in the panel and a progress bar popup with no progress shown.
http://img688.imageshack.us/i/snapshot1h.jpg/

5. I click on the notification widget to show extended information
http://img688.imageshack.us/i/snapshot1r.jpg/

6. I now click the 'stop button' to cancel the job, only then notification goes away.

I have not tried it with bigger files and/or folders, but it happens everytime with small and/or a single file deletion case.

Tested with today's kde (4.5) trunk + qt git compiled about 3hours ago.

Let me know if you need any info