Still a newbie here but this may help some Krusader users.
1) Check the "main" window and see if you can tell if Krusader is actually moving files. I usually leave it on MB/s view. I would wait until the system is in-active before proceeding. Next, if Krusader wont open the GUI and it was working fine before. I just stop the app, go into settings and change
/mnt/user/appdata/kde/ to
/mnt/user/appdata/kde2/
restart the app and if the GUI works ... the appdata had become corrupted
I dont know how to fix it but this will get you up and running quickly.
2) To get the "transfer progress window" back, it's explained somewhere in these forums, it's easy.
Click anywhere in the Krusader window. Then hold the SHIFT-ALT-CTRL down at the same time. A large side menu will pop-up. Choose the button "on screen keyboard". Using the Large "on screen keyboard" that pops up. Click on ALT then TAB to scroll thru any "transfer progress windows" that have been hidden. When you highlight the "transfer window" that you want to appear. On your REAL keyboard hold the SHIFT-ALT-CTRL down at the same time again. Choose the "none" option on "text input" method, and your back to seeing the "transfer progress window" that you've chosen. You can do this multiple times if you have a "queue" and "do not close when done" transfer windows that you want to bring forward.
Good Luck all !!