I'm experiencing a recurring crash in Growl 1.3.3 on OSX 10.7.4. I have a bunch of apps sending Growl notifications (including some via growlnotify 1.3) and growl on this host is configured to forward notifications to a laptop on the local network (which is often sleeping or otherwise unavailable).
Process:         Growl [83420]
Path:            /Applications/Growl.app/Contents/MacOS/Growl
Identifier:      com.Growl.GrowlHelperApp
Version:         1.3.3 (1.3.3)
App Item ID:     467939042
App External ID: 6097965
Code Type:       X86-64 (Native)
Parent Process:  launchd [341]
Date/Time:       2012-05-27 20:38:37.872 +1000
OS Version:      Mac OS X Server 10.7.4 (11E53)
Report Version:  9
Crashed Thread:  0  Dispatch queue: com.apple.main-thread
Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: 0x000000000000000d, 0x0000000000000000
VM Regions Near 0:
--> 
    __TEXT                 0000000101076000-00000001010e9000 [  460K] r-x/rwx SM=COW  /Applications/Growl.app/Contents/MacOS/Growl
Application Specific Information:
objc_msgSend() selector name: packetDidDisconnect:
objc[83420]: garbage collection is OFF
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib               	0x00007fff9635de96 objc_msgSend + 22
1   com.Growl.GrowlHelperApp      	0x00000001010b3379 __33-[GCDAsyncSocket closeWithError:]_block_invoke_0 + 74
2   libdispatch.dylib             	0x00007fff93e96a86 _dispatch_call_block_and_release + 18
3   libdispatch.dylib             	0x00007fff93e988f6 _dispatch_main_queue_callback_4CF + 308
4   com.apple.CoreFoundation      	0x00007fff93ff6e7c __CFRunLoopRun + 1724
5   com.apple.CoreFoundation      	0x00007fff93ff6486 CFRunLoopRunSpecific + 230
6   com.apple.HIToolbox           	0x00007fff90a2c4d3 RunCurrentEventLoopInMode + 277
7   com.apple.HIToolbox           	0x00007fff90a33781 ReceiveNextEventCommon + 355
8   com.apple.HIToolbox           	0x00007fff90a3360e BlockUntilNextEventMatchingListInMode + 62
9   com.apple.AppKit              	0x00007fff9781be31 _DPSNextEvent + 659
10  com.apple.AppKit              	0x00007fff9781b735 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 135
11  com.apple.AppKit              	0x00007fff97818071 -[NSApplication run] + 470
12  com.Growl.GrowlHelperApp      	0x000000010109a529 -[GrowlApplication run] + 182
13  com.apple.AppKit              	0x00007fff97a94244 NSApplicationMain + 867
14  com.Growl.GrowlHelperApp      	0x0000000101082625 main + 134
15  com.Growl.GrowlHelperApp      	0x0000000101077924 start + 52
The crashes all appear to be happening in the same place. At a guess something isn't dealing very well with the case where the connection is lost (either between growl <-> app or growl <-> growl server (laptop)).
It looks like someone else posted about this same issue on Jan 29th, but there doesn't appear to be any resolution mentioned in that thread:
I'm happy to provide any other details that may assist in tracking this down and fixing it!