I had MC crash when I was cmd+tab'ing through apps and hit CMD+Q to quit it.
Not a big deal, as crashing was as effective as quitting, but figured I'd pass the crash log along.
Process: Media Center 18 [30065]
Path: /Applications/Media Center 18.app/Contents/MacOS/Media Center 18
Identifier: JRiver.Media-Center-18
Version: 18.0.141 (?)
Code Type: X86-64 (Native)
Parent Process: launchd [300]
User ID: 501
Date/Time: 2013-02-28 15:03:08.048 -0800
OS Version: Mac OS X 10.8.2 (12C60)
Report Version: 10
Interval Since Last Report: 346434 sec
Crashes Since Last Report: 19
Per-App Crashes Since Last Report: 1
Anonymous UUID: 924DA13D-0AC1-F9C5-6976-6E1CDC3329E6
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000020
VM Regions Near 0x20:
-->
__TEXT 0000000100000000-0000000101316000 [ 19.1M] r-x/rwx SM=COW /Applications/Media Center 18.app/Contents/MacOS/Media Center 18
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 JRiver.Media-Center-18 0x0000000100851b30 0x100000000 + 8723248
1 JRiver.Media-Center-18 0x0000000100852966 0x100000000 + 8726886
2 JRiver.Media-Center-18 0x000000010085a368 0x100000000 + 8758120
3 JRiver.Media-Center-18 0x000000010059ef2c 0x100000000 + 5893932
4 JRiver.Media-Center-18 0x0000000100596129 0x100000000 + 5857577
5 JRiver.Media-Center-18 0x0000000100596088 0x100000000 + 5857416
6 JRiver.Media-Center-18 0x000000010059ef2c 0x100000000 + 5893932
7 JRiver.Media-Center-18 0x0000000100878da0 0x100000000 + 8883616
8 JRiver.Media-Center-18 0x0000000100870af6 0x100000000 + 8850166
9 JRiver.Media-Center-18 0x0000000100870676 0x100000000 + 8849014
10 JRiver.Media-Center-18 0x0000000100870404 0x100000000 + 8848388
11 JRiver.Media-Center-18 0x000000010079f6eb 0x100000000 + 7993067
12 JRiver.Media-Center-18 0x000000010079f2e1 0x100000000 + 7992033
13 JRiver.Media-Center-18 0x000000010079f0cb 0x100000000 + 7991499
14 JRiver.Media-Center-18 0x00000001000013b7 0x100000000 + 5047
15 JRiver.Media-Center-18 0x000000010083cf3c 0x100000000 + 8638268
16 libsystem_c.dylib 0x00007fff88c0d307 __cxa_finalize + 200
17 libsystem_c.dylib 0x00007fff88c0ef57 exit + 15
18 com.apple.AppKit 0x00007fff81a98c0e -[NSApplication terminate:] + 1806
19 com.apple.AppKit 0x00007fff81abd57e -[NSApplication _terminateFromSender:askIfShouldTerminate:saveWindows:] + 280
20 com.apple.AppKit 0x00007fff81ac74a2 __52-[NSApplication(NSAppleEventHandling) _handleAEQuit]_block_invoke_0 + 46
21 libdispatch.dylib 0x00007fff83684f01 _dispatch_call_block_and_release + 15
22 libdispatch.dylib 0x00007fff836810b6 _dispatch_client_callout + 8
23 libdispatch.dylib 0x00007fff836860c8 _dispatch_main_queue_callback_4CF + 275
24 com.apple.CoreFoundation 0x00007fff864670fe __CFRunLoopRun + 1614
25 com.apple.CoreFoundation 0x00007fff864666b2 CFRunLoopRunSpecific + 290
26 com.apple.HIToolbox 0x00007fff857140a4 RunCurrentEventLoopInMode + 209
27 com.apple.HIToolbox 0x00007fff85713d84 ReceiveNextEventCommon + 166
28 com.apple.HIToolbox 0x00007fff85713cd3 BlockUntilNextEventMatchingListInMode + 62
29 com.apple.AppKit 0x00007fff81872613 _DPSNextEvent + 685
30 com.apple.AppKit 0x00007fff81871ed2 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
31 JRiver.Media-Center-18 0x00000001003908e8 0x100000000 + 3737832
32 JRiver.Media-Center-18 0x000000010083a4f3 0x100000000 + 8627443
33 JRiver.Media-Center-18 0x000000010039088a 0x100000000 + 3737738
34 JRiver.Media-Center-18 0x000000010039096a 0x100000000 + 3737962
35 com.apple.CoreFoundation 0x00007fff8647747a _CFXNotificationPost + 2554
36 com.apple.Foundation 0x00007fff88219846 -[NSNotificationCenter postNotificationName:object:userInfo:] + 64
37 com.apple.AppKit 0x00007fff8187960d -[NSApplication _postDidFinishNotification] + 292
38 com.apple.AppKit 0x00007fff81869cba -[NSApplication finishLaunching] + 2177
39 com.apple.AppKit 0x00007fff818690fa -[NSApplication run] + 124
40 JRiver.Media-Center-18 0x000000010039042b 0x100000000 + 3736619
41 JRiver.Media-Center-18 0x00000001000012c4 start + 52
VM Region Summary:
ReadOnly portion of Libraries: Total=184.5M resident=87.6M(47%) swapped_out_or_unallocated=96.9M(53%)
Writable regions: Total=233.9M written=66.7M(29%) resident=31.7M(14%) swapped_out=74.8M(32%) unallocated=202.2M(86%)
REGION TYPE VIRTUAL
=========== =======
CG backing stores 36.3M
CG image 4K
CG shared images 320K
CoreServices 5152K
MALLOC 138.9M
MALLOC guard page 48K
MALLOC_LARGE (reserved) 1380K reserved VM address space (unallocated)
Memory tag=240 4K
Memory tag=242 12K
Memory tag=251 12K
STACK GUARD 56.0M
Stack 32.9M
VM_ALLOCATE 22.7M
__DATA 13.0M
__IMAGE 528K
__LINKEDIT 57.6M
__TEXT 126.9M
__UNICODE 544K
mapped file 39.2M
shared memory 308K
=========== =======
TOTAL 531.7M
TOTAL, minus reserved VM space 530.4M
Model: MacBookPro8,2, BootROM MBP81.0047.B27, 4 processors, Intel Core i7, 2.3 GHz, 8 GB, SMC 1.69f4
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In, 512 MB
Graphics: AMD Radeon HD 6750M, AMD Radeon HD 6750M, PCIe, 1024 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353237334348302D4348392020
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353237334348302D4348392020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.98.81.22)
Bluetooth: Version 4.0.9f33 10885, 2 service, 11 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: OWC Mercury EXTREME Pro 6G SSD, 120.03 GB
Serial ATA Device: Hitachi HTS725050A9A362, 500.11 GB
USB Device: hub_device, 0x0424 (SMSC), 0x2513, 0xfd100000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd110000 / 3
USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x8509, 0xfa200000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2513, 0xfa100000 / 2
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 5
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x821a, 0xfa113000 / 7
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0245, 0xfa120000 / 4