Comment # 2 on bug 1036144 from Wolfgang Bauer

(In reply to George Anchev from comment #1)
> Created attachment 722667 [details]
> Example of KTorrent added in autostart.
> 
> The same seems to be the case for a desktop program (e.g. KTorrent). It
> doesn't auto start.

At least in this case, the problem is obvious:
ktorrent 5.0 does not support the command line parameter "-caption", so it
fails to start.

Try to run something like "ktorrent -caption xxx" in a terminal window and
you'll see... ;-)

Apparently you are using an old KDE4 .desktop file?
Remove that and use the current one.

"-caption" was actually handled by the KDE libraries in 4.x, but nowadays Qt
itself is used to parse the command line argumends and it uses "-qwindowtitle"
instead of "-caption".