Version:            (using KDE 4.2.90)
OS:                Linux
Installed from:    Ubuntu Packages

Often when I copy-paste a file with ctrl+c ctrl+v or by dragging and selecting copy, the filenames become the whole path from where they are copied. Sounds strange indeed.
A file in directory "/home/pascal/diku/klynge/assignment 5/" called parallel.py is renamed to "file:⁄⁄⁄home⁄pascal⁄diku⁄klynge⁄assignment 5⁄nbody_parallel.py" when I copy it to another location. However the file is complete and is copied to the correct destination.

Clearly, these are other types of slashes than the path separators my file system, so it just thinks it is a part of the filename. 
Perhaps a problem with character encoding?
I haven't had this problem in KDE 4.2.
My filesystem is ext3 with UTF-8 character encoding.

It doesn't seem to happen when I move or cut-and-paste files.