STILL having the same issue even with a new laptop. Here is the detailed error report. I am running MacOSx Snow Leopard, completely up to date.
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Process: kvirc [379]
Path: /Volumes/KVIrc-4.1.1-r4838-ub/KVIrc-4.1.1-r4838-ub.app/Contents/MacOS/kvirc
Identifier: com.kvirc.kvirc
Version:

(

)
Code Type: X86 (Native)
Parent Process: launchd [86]
Date/Time: 2011-04-16 22:21:52.213 -0500
OS Version: Mac OS X 10.6.7 (10J869)
Report Version: 6
Interval Since Last Report: 95913 sec
Crashes Since Last Report: 2
Per-App Crashes Since Last Report: 1
Anonymous UUID: A7C0031F-FCCD-4D9B-8476-C710C7B6394E
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0
Dyld Error Message:
Library not loaded: QtWebKit.framework/Versions/4/QtWebKit
Referenced from: /Volumes/KVIrc-4.1.1-r4838-ub/KVIrc-4.1.1-r4838-ub.app/Contents/MacOS/kvirc
Reason: image not found
Binary Images:
0x8fe00000 - 0x8fe4162b dyld 132.1 (

) <749D24EE-54BD-D74B-D305-C13F5E6C95D8> /usr/lib/dyld
Model: MacBookPro7,1, BootROM MBP71.0039.B0B, 2 processors, Intel Core 2 Duo, 2.4 GHz, 4 GB, SMC 1.62f6
Graphics: NVIDIA GeForce 320M, NVIDIA GeForce 320M, PCI, 256 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.10.131.36.9)
Bluetooth: Version 2.4.0f1, 2 service, 12 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: Hitachi HTS545025B9SA02, 232.89 GB
Serial ATA Device: MATSHITADVD-R UJ-898
USB Device: Internal Memory Card Reader, 0x05ac (Apple Inc.), 0x8403, 0x26100000
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8507, 0x24600000
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06600000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8213, 0x06610000
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x06500000
USB Device: Apple Internal Keyboard / Trackpad, 0x05ac (Apple Inc.), 0x0236, 0x06300000