the chunk below is from my mb4,1. I will post a report from my iMac8,1 when I get home.
=============================================
Date/Time: 2011-02-07 19:44:15 +0000
OS Version: 10.6.6 (Build 10J567)
Architecture: x86_64
Report Version: 7

Command: KisMAC
Path: /Users/xxxx/Desktop/KisMAC.app/Contents/MacOS/KisMAC
Version: KisMAC 0.3.3 (0.3.3)
Parent: launchd [190]

PID: 58204
Event: hang
Duration: 4.90s (sampling started after 2 seconds)
Steps: 9 (100ms sampling interval)

Pageins: 16
Pageouts: 0


Process: KisMAC [58204]
Path: /Users/xxxx/Desktop/KisMAC.app/Contents/MacOS/KisMAC
UID: 501

Thread 6fc2b7c DispatchQueue 1
User stack:
9 start + 52 (in KisMAC) [0x100002044]
9 main + 195 (in KisMAC) [0x10000210f]
9 NSApplicationMain + 364 (in AppKit) [0x7fff8070d1a8]
9 -[NSApplication run] + 395 (in AppKit) [0x7fff8071448b]
9 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155 (in AppKit) [0x7fff8074e7a9]
9 _DPSNextEvent + 718 (in AppKit) [0x7fff8074ee64]
9 BlockUntilNextEventMatchingListInMode + 59 (in HIToolbox) [0x7fff86c2e5f8]
9 ReceiveNextEventCommon + 310 (in HIToolbox) [0x7fff86c2e73f]
9 RunCurrentEventLoopInMode + 333 (in HIToolbox) [0x7fff86c2e93a]
9 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff875b4dbf]
9 __CFRunLoopRun + 6488 (in CoreFoundation) [0x7fff875b6be8]
9 __NSFireTimer + 114 (in Foundation) [0x7fff861ca8f5]
9 -[WaveScanner doChannelHop:] + 101 (in KisMAC) [0x100024cda]
9 -[WaveDriver hopToNextChannel] + 570 (in KisMAC) [0x100039073]
9 -[WaveDriverAirportExtreme setChannel:] + 150 (in KisMAC) [0x100056383]
9 sleep + 61 (in libSystem.B.dylib) [0x7fff873cadf0]
9 __semwait_signal + 10 (in libSystem.B.dylib) [0x7fff8737dfca]
Kernel stack:
9 semaphore_wait_continue + 0 [0x22a3dd]

Thread 941b7a8 DispatchQueue 2
User stack:
9 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff8735d005]
9 _pthread_wqthread + 353 (in libSystem.B.dylib) [0x7fff8735d168]
9 _dispatch_worker_thread2 + 252 (in libSystem.B.dylib) [0x7fff8735d83e]
9 _dispatch_queue_invoke + 185 (in libSystem.B.dylib) [0x7fff8735dd14]
9 kevent + 10 (in libSystem.B.dylib) [0x7fff8735c16a]
Kernel stack:
9 kevent + 97 [0x473932]

Thread 8b91000
User stack:
9 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff8735d005]
9 __workq_kernreturn + 10 (in libSystem.B.dylib) [0x7fff8735cf8a]
Kernel stack:
9 bsdthread_create + 1313 [0x4cd603]

Thread ac2b3d4
User stack:
9 thread_start + 13 (in libSystem.B.dylib) [0x7fff8737c3e9]
9 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff8737c536]
9 __NSThread__main__ + 1429 (in Foundation) [0x7fff861750a5]
9 -[WaveScanner doScan:] + 152 (in KisMAC) [0x100024c3a]
9 -[WaveScanner doPassiveScan:] + 972 (in KisMAC) [0x100025be4]
9 -[WaveDriverAirportExtreme nextFrame] + 53 (in KisMAC) [0x100055f79]
9 pcap_next + 37 (in libpcap.A.dylib) [0x10021cd9b]
9 read + 10 (in libSystem.B.dylib) [0x7fff8734d9c6]
Kernel stack:
9 lo64_unix_scall + 77 [0x2a143d]
9 unix_syscall64 + 617 [0x4f13be]
9 read_nocancel + 158 [0x498faa]
9 write + 312 [0x49882e]
9 utf8_encodelen + 3711 [0x2f319c]
9 VNOP_READ + 157 [0x2fe14d]
9 spec_read + 104 [0x30b5f2]
9 bpfread + 215 [0x316e99]
9 tsleep + 105 [0x48a634]
9 wakeup + 786 [0x48a20d]
9 thread_block + 33 [0x2272e7]
9 thread_block_reason + 331 [0x227259]
9 thread_dispatch + 1966 [0x226fba]
9 machine_switch_context + 753 [0x2a8a6e]

Thread d1df7a8
User stack:
9 thread_start + 13 (in libSystem.B.dylib) [0x7fff8737c3e9]
9 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff8737c536]
9 select$DARWIN_EXTSN + 10 (in libSystem.B.dylib) [0x7fff87386e92]
Kernel stack:
9 sleep + 52 [0x48a3f9]

Binary Images:
0x100000000 - 0x10009cfff org.kismac-ng.kismac KisMAC 0.3.3 (0.3.3) /Users/yiyu/Desktop/KisMAC.app/Contents/MacOS/KisMAC
0x100205000 - 0x100238ff7 libpcap.A.dylib ??? (???) /usr/lib/libpcap.A.dylib
0x7fff8070b000 - 0x7fff81101fff com.apple.AppKit 6.6.7 (1038.35) /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
0x7fff86164000 - 0x7fff863e7ff7 com.apple.Foundation 6.6.4 (751.42) /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
0x7fff86c00000 - 0x7fff86efefe7 com.apple.HIToolbox 1.6.4 (???) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox
0x7fff87342000 - 0x7fff87503fff libSystem.B.dylib ??? (???) /usr/lib/libSystem.B.dylib
0x7fff87569000 - 0x7fff876e0fe7 com.apple.CoreFoundation 6.6.4 (550.42) /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation

my settings:
general options: tick, tick
filter: none
sounds: none
driver:
Apple Airport Extreme card, passive mode
Channel 1~14
Keep everything
Hopping frequency: 0.25s
GPS: do not use
Traffic: tick, tick, 2
Advanced: 100, 0, 2, untick

no offence to the developer, but I don't keep unusable apps in my Applications folder - where KisMAC 0.2.99 is. It's decompressed onto my desktop so I can quickly delete after testing it.

sorry I forgot to answer your most important question: I'm in the UK

many thanks to JoeNoname, my problem is solved by unchecking ch14. I was being greedy and had KisMAC to sniff all channels for me :)

KisMAC 0.3.3 is now in my Applications folder :)
But why 0.2.99- had no problem with ch14 before?

Well, trace back to all my posts, I never called, or implied that KisMAC is piece of anything.

It's an excellent program and I've been using it for years. Even when 0.3.0/1/2/3 crashed on my machines, I still gave it a 4-start rating and rolled back to 0.2.99. I'm thankful for the developer's effort in maintaining this project, but I'm not sorry for anything or anyone.

On the other hand, I'd appreciate it if the developer would investigate why scanning ch14 worked fine with 0.2.99 and before, but stopped working since 0.3.0. CH13/14 isn't used in some regions, but it doesn't mean the WiFi card can not scan it. It's obviously a new bug since KisMAC 0.3.0, because 0.2.99- could cope with ch14, on my same machines, with no problem.

Here's more info that may be helpful:

I'm in a computer lab where no neighbour is nearby. I only run my experiments on 802.11n. According to my analogue spectrum analyser, CH14 isn't occupied. I use KisMAC as an additional digital scanner to monitor 802.11b/g usages near my test-bed.

I am also glad that I can finally keep up with the latest KisMAC. And thanks to JoeNoname gain, for the fix.

Done. Ticket #806