Bug 91298

Version:           1.3.0 (using KDE 3.3.0, Gentoo)
Compiler:          gcc version 3.3.2 20031218 (Gentoo Linux 3.3.2-r5, propolice-3.3-7)
OS:                Linux (i686) release 2.6.8.1

Whenever I try to remove items from e.g. the sequence diagram Umbrella crashes. It does so everytime I try to delete or cut items from the diagrams.

I the KDE Crash Handler I get the following printout:

Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 4900)]
0x41350b18 in waitpid ()
   from /lib/libpthread.so.0
#0  0x41350b18 in waitpid () from /lib/libpthread.so.0
#1  0x40920a48 in ?? () from /usr/kde/3.3/lib/libkdecore.so.4
#2  0x40844c14 in KCrash::defaultCrashHandler(int) ()
   from /usr/kde/3.3/lib/libkdecore.so.4
#3  0x410c0af0 in __JCR_LIST__ () from /usr/qt/3/lib/libqt-mt.so.3
#4  0x00000001 in ?? ()
#5  0x40926d74 in kde_malloc_is_used () from /usr/kde/3.3/lib/libkdecore.so.4
#6  0x40926d74 in kde_malloc_is_used () from /usr/kde/3.3/lib/libkdecore.so.4
#7  0xbfffdd50 in ?? ()
#8  0x0000136a in ?? ()
#9  0x00000400 in ?? ()
#10 0x00000400 in ?? ()
#11 0x00000009 in ?? ()
#12 0x00000049 in ?? ()
#13 0x40926d40 in kde_malloc_is_used () from /usr/kde/3.3/lib/libkdecore.so.4
#14 0x40920a48 in ?? () from /usr/kde/3.3/lib/libkdecore.so.4
#15 0x40926d24 in kde_malloc_is_used () from /usr/kde/3.3/lib/libkdecore.so.4
#16 0x00000001 in ?? ()

Any idea why this happens?
Workaround?