Version:            (using KDE KDE 3.5.5)
Installed from:    Ubuntu Packages
OS:                Linux

I can reproduce a SIGSEGV crash doing the following:
Select Tag -> New Tag from the menu. Go to select icon and pres "ok" and then CRASH!

Guess this backtrace isn't of much help: 

(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1239066960 (LWP 9296)]
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[KCrash handler]
#6  0x0804f0c0 in ?? ()
#7  0x0804f0c0 in ?? ()
#8  0x085067f8 in ?? ()
#9  0x00000010 in ?? ()
#10 0x00000039 in ?? ()
#11 0x080603d0 in ?? ()
#12 0x00000000 in ?? ()