Sometimes clicking on the "Add files" button does not bring up the file dialog, and freezes the UI. 
I suspect that it's because the disks have spun down, and the program does not give them enough time to spin back up before locking up.

Reproducible: Always

Steps to Reproduce:
1.Open kdenlive
2.Wait long enough so that hard drives go into suspend
3.Click on "Add files" button

Actual Results:  
User interface freezes, and no file dialog appears

Expected Results:  
Disks spin up and a file dialog appear.

I tried getting a backtrace with gdb, but kdenlive did not actually abort. It's still running, just frozen, waiting forever for the disks. 

I don't know if it's a kdenlive bug, or due to plasma, but it's certainly apparent in kdenlive. 
I know that normally you get a file dialog, but I sometimes open kdenlive, and then get distracted without opening any files, then, later when I get back to it, I lock up kdenlive with the first button I click on.