When I copies or move files in KDE4, a progress bar appears in low right corner of the screen. A few seconds it disappears leaving a small icon with a (i). When I click on that (i) i can see the progress bar again.
But if a click on show desktop or choose another workspace, the progress bar goes away and never comes back. Only the (i) still appears in the system tray. When the operation of coping files or movie finishes, that icon disappears too.
I notice that disappear of the progress bar on two different machines. Both with Slackware-current (13.0.0) installed.
Any one notice a similar problem?

The two machines are different. Only the graphic cards are both nvidia, but are different models too.
The software I use on them both are:

feh (to make conky transparency)
conky
hddtemp
amsn
rtorrent

Any idea on this issue?

That is the intended behaviour.

You need to see the kde4 docs for changing it

But it disappaers forever. Clicking in (i) icon, don't make any difference, the bar don't appears no more. The (i) icon only disappaers when all tasks are finished.
But since I can't see the progress bar, even after clicking the (i). I never know how much time remains.