I run Avid Media Composer 5.0.3 on a Mac Book Pro 7. It ran fine on 10.6.8, then eventually crashed and wouldn't even open. I installed OS 10.6.7 and Avid ran great all day. Then after closing the program and trying to open it again the next day, the same error happened: "Bus error" in thread "Main Thread", at adress 0x0.

In the details it shows:
Thread 0 crashed with X86 Thread State (32-bit):
  eax: 0x00000000  ebx: 0x51d33a9b  ecx: 0xffffffff  edx: 0x00000007
  edi: 0x00000000  esi: 0xbfffe540  ebp: 0xbfffe4c8  esp: 0xbfffe4a0
   ss: 0x0000001f  efl: 0x00010246  eip: 0x51ecd882   cs: 0x00000017
   ds: 0x0000001f   es: 0x0000001f   fs: 0x00000000   gs: 0x00000037
  cr2: 0x00000000

I recently installed new fonts, would that have anything to do with it? Is it my mac OS or is it Avid?

Thanks for any help!

More on the crash details:

Process:         AvidMediaComposer [5288]
Path:            /Applications/Avid Media Composer/AvidMediaComposer.app/Contents/MacOS/AvidMediaComposer
Identifier:      com.avid.mediacomposer
Version:         5.0.3.20780 (5.0.3)
Code Type:       X86 (Native)
Parent Process:  launchd [142]

Date/Time:       2011-08-09 12:04:32.381 -0400
OS Version:      Mac OS X 10.6.7 (10J869)
Report Version:  6

Interval Since Last Report:          2638 sec
Crashes Since Last Report:           7
Per-App Interval Since Last Report:  911 sec
Per-App Crashes Since Last Report:   7
Anonymous UUID:                      E88723C7-BF4D-4FE8-BF11-5EF0A023EA9C

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   com.avid.Caption                  0x51ecd882 std::string::compare(char const*) const + 36
1   com.avid.Caption                  0x51d33c06 (anonymous namespace)::Try2AddFile((anonymous namespace)::Library&, std::map<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >, std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >, FEUtils::CaseInsensativeLess, std::allocator<std::pair<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> > const, std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> > > > >*, std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> > const&) + 374
2   com.avid.Caption                  0x51d33f59 (anonymous namespace)::ReadFontsDirNameMap() + 249
3   com.avid.Caption                  0x51d34068 FEUtils::FontFinder::FontFinder() + 32
4   com.avid.Caption                  0x51d07875 FEUtils::FontFinder::Get() + 55
5   com.avid.Caption                  0x51d04dca (anonymous namespace)::SetupVisibleParameters(IACFComponentFactory*, IAVXEffectDefinition*, IAVXParamDefinitionGenerator*) + 1300
6   com.avid.Caption                  0x51d075f8 ACFRegisterComponent + 304
7   AVX2PluginHost.dylib              0x036cc5db CAVX2Host::RegisterPlugin(acfNativeFileSpec_t*) + 929
8   AVX2PluginHost.dylib              0x036cc995 CAVX2Host::RegisterDirectory(acfNativeFileSpec_t*) + 341
9   AVX2PluginHost.dylib              0x036cb224 CAVX2Host::RegisterLocalPlugins() + 40
10  com.avid.mediacomposer            0x00878213 acfHostComp::InitializeInstance(IACFUnknown*) + 199
11  com.avid.mediacomposer            0x0087959e acfHostComp::Init(unsigned long, unsigned long, char const*, char const*, unsigned long long, char const*, unsigned long, unsigned long) + 186
12  com.avid.mediacomposer            0x00041366 MediaComposerApp::FinishInit() + 7226
13  libUIShell.dylib                  0x0372cf6c AApplication::IApplication() + 734
14  libUIShell.dylib                  0x03730e86 AApplication::Go() + 86
15  com.avid.mediacomposer            0x0003da59 main + 209
16  com.avid.mediacomposer            0x00002c52 _start + 216
17  com.avid.mediacomposer            0x00002b79 start + 41

3 things to try, one at a time:

1.  Get 5.0.4 from the Download Center, uninstall 5.0.3.x and install 5.0.4.  It still requires OSX 10.6.7 but has a number of bug fixes.

2.  Try repairing permissions on your drive.  Can't hurt, might help.

3.  Uninstall those new fonts and see if they were the culprits.

Hey, thanks for the response.

I uninstalled the fonts and that seemed to do the trick.