Ktorrent 1.0 works fine in my box, bet ktorrent 1.2 stopped working - it`s crashing at startup. I am using up-to-date stable gentoo linux. I tried to delete all ktorrent-related stuff un my box but i doesn`t help. If I run ktorrent --debug i got this:

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$ ktorrent --debug
Bound to port 6881
Loading plugin searchplugin
Loading plugin infowidgetplugin
KCrash: Application 'ktorrent' crashing...
ERROR: Communication problem with ktorrent, it probably crashed.

It seems to crash at "infowidgetplugin". After removing "infowidgetplugin" from .kde/share/apps/ktorrent/plugins i got this:

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$ ktorrent --debug
Bound to port 6881
Loading plugin searchplugin
Showing KT

Yes, it works! But now i will try to open torrent file for download:

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$ Loading file /downloads/***.torrent
Encoding : UTF-8
Multi file torrent
Starting download
Doing tracker request to url : http://***.lv/****
KCrash: Application 'ktorrent' crashing...

KT crashed again...

Everthink about my system:

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Portage 2.0.54-r2 (default-linux/x86/2005.0, gcc-3.3.6, glibc-2.3.2-r9,glibc-2.3.6-r3, 2.6.16-gr2diz i686)
=================================================================
System uname: 2.6.16-gr2diz i686 AMD Athlon(tm) XP 3200+
Gentoo Base System version 1.6.14
dev-lang/python:     2.2.3-r5, 2.3.5-r2, 2.4.2
dev-python/pycrypto: 2.0.1-r5
dev-util/ccache:     [Not Present]
dev-util/confcache:  [Not Present]
sys-apps/sandbox:    1.2.17
sys-devel/autoconf:  2.13, 2.59-r7
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r1
sys-devel/binutils:  2.16.1
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.11-r2
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-Os -march=athlon-xp -pipe -fomit-frame-pointer -ffast-math -funroll-loops"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb /usr/share/config /var/bind /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/eselect/compiler /etc/gconf /etc/terminfo /etc/env.d"
CXXFLAGS="-Os -march=athlon-xp -pipe -fomit-frame-pointer -ffast-math -funroll-loops"

Have you got a backtrace ?

And, have you tried running the newly release 2.0beta1 ?

No, i didn't tried it.

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This backtrace appears to be of no use.
This is probably because your packages are built in a way which prevents creation of proper backtraces, or the stack frame was seriously corrupted in the crash.

(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)
`system-supplied DSO at 0xffffe000' has disappeared; keeping its symbols.
(no debugging symbols found)
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[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 12318)]
0xb6a4e6f5 in nanosleep () from /lib/libc.so.6
#0  0xb6a4e6f5 in nanosleep () from /lib/libc.so.6
#1  0xb6a4e55f in sleep () from /lib/libc.so.6
#2  0xb76df477 in KCrash::startDrKonqi () from /usr/kde/3.5/lib/libkdecore.so.4
#3  0xb6ad9880 in sys_sigabbrev () from /lib/libc.so.6
#4  0xb6a2be61 in mallopt () from /lib/libc.so.6


The backtrace isn't of much use, you should try 2.0beta1

2.0beta1 opens and closes after ~1 second.

Backtrace:

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(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)
`system-supplied DSO at 0xffffe000' has disappeared; keeping its symbols.
(no debugging symbols found)
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[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 32066)]
0xb69326f5 in nanosleep () from /lib/libc.so.6
#0  0xb69326f5 in nanosleep () from /lib/libc.so.6
#1  0xb693255f in sleep () from /lib/libc.so.6
#2  0xb75c3477 in KCrash::startDrKonqi () from /usr/kde/3.5/lib/libkdecore.so.4
#3  0xb7363350 in ?? () from /usr/qt/3/lib/libqt-mt.so.3
#4  0xbfe2aff0 in ?? ()
#5  0xbfe2ade8 in ?? ()
#6  0xbfe2ade0 in ?? ()
#7  0x00000011 in ?? ()
#8  0x00000003 in ?? ()
#9  0x00000004 in ?? ()
#10 0x00000004 in ?? ()
#11 0x00007d4c in ?? ()
#12 0x6f6b7264 in ?? ()
#13 0x0069716e in ?? ()
#14 0x7369642d in ?? ()
#15 0x79616c70 in ?? ()
#16 0x2e303a00 in ?? ()
#17 0x2d2d0030 in ?? ()
#18 0x6e707061 in ?? ()
#19 0x00656d61 in ?? ()
#20 0x726f746b in ?? ()
#21 0x746e6572 in ?? ()
#22 0x732d2d00 in ?? ()
#23 0x616e6769 in ?? ()
#24 0x0036006c in ?? ()
#25 0x69702d2d in ?? ()
#26 0x32330064 in ?? ()
#27 0x00363630 in ?? ()
#28 0x70612d2d in ?? ()
#29 0x72657670 in ?? ()
#30 0x6e6f6973 in ?? ()
#31 0x302e3200 in ?? ()
#32 0x61746562 in ?? ()
#33 0x2d2d0031 in ?? ()
#34 0x676f7270 in ?? ()
#35 0x6e6d6172 in ?? ()
#36 0x00656d61 in ?? ()
#37 0x726f544b in ?? ()
#38 0x746e6572 in ?? ()
#39 0x622d2d00 in ?? ()
#40 0x64616775 in ?? ()
#41 0x73657264 in ?? ()
#42 0x75730073 in ?? ()
#43 0x74696d62 in ?? ()
#44 0x67756240 in ?? ()
#45 0x646b2e73 in ?? ()
#46 0x726f2e65 in ?? ()
#47 0x2d2d0067 in ?? ()
#48 0x72617473 in ?? ()
#49 0x69707574 in ?? ()
#50 0x00300064 in ?? ()
#51 0x00000000 in ?? ()


I did "rm -rf ~/.kde3.5/share/apps/ktorrent ~/.kde3.5/share/config/ktorrentrc" and ktorrent started to work, but after finishing downloading file it crashes:

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(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)
`system-supplied DSO at 0xffffe000' has disappeared; keeping its symbols.
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
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[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 465)]
0xb69886f5 in nanosleep () from /lib/libc.so.6
#0  0xb69886f5 in nanosleep () from /lib/libc.so.6
#1  0xb698855f in sleep () from /lib/libc.so.6
#2  0xb7619477 in KCrash::startDrKonqi () from /usr/kde/3.5/lib/libkdecore.so.4
#3  0x085255f0 in ?? ()
#4  0x085415f8 in ?? ()
#5  0xb6a09ae0 in in6addr_loopback () from /lib/libc.so.6
#6  0xbfd80de0 in ?? ()
#7  0x00000011 in ?? ()
#8  0x00000003 in ?? ()
#9  0x00000004 in ?? ()
#10 0x00000004 in ?? ()
#11 0x000001ef in ?? ()
#12 0x6f6b7264 in ?? ()
#13 0x0069716e in ?? ()
#14 0x7369642d in ?? ()
#15 0x79616c70 in ?? ()
#16 0x2e303a00 in ?? ()
#17 0x2d2d0030 in ?? ()
#18 0x6e707061 in ?? ()
#19 0x00656d61 in ?? ()
#20 0x726f746b in ?? ()
#21 0x746e6572 in ?? ()
#22 0x732d2d00 in ?? ()
#23 0x616e6769 in ?? ()
#24 0x0036006c in ?? ()
#25 0x69702d2d in ?? ()
#26 0x36340064 in ?? ()
#27 0x2d2d0035 in ?? ()
#28 0x76707061 in ?? ()
#29 0x69737265 in ?? ()
#30 0x32006e6f in ?? ()
#31 0x6562302e in ?? ()
#32 0x00316174 in ?? ()
#33 0x72702d2d in ?? ()
#34 0x6172676f in ?? ()
#35 0x6d616e6d in ?? ()
#36 0x544b0065 in ?? ()
#37 0x6572726f in ?? ()
#38 0x2d00746e in ?? ()
#39 0x6775622d in ?? ()
#40 0x72646461 in ?? ()
#41 0x00737365 in ?? ()
#42 0x6d627573 in ?? ()
#43 0x62407469 in ?? ()
#44 0x2e736775 in ?? ()
#45 0x2e65646b in ?? ()
#46 0x0067726f in ?? ()
#47 0x74732d2d in ?? ()
#48 0x75747261 in ?? ()
#49 0x00646970 in ?? ()
#50 0x00000030 in ?? ()
#51 0x00000000 in ?? ()


With this information I can't do much, I don't know where it crashes.

Could you compile with debugging information :

./configure --enable-debug=full
make
make install