HELP - Game crashing when trying to open tf2 maps in sandbox

[ragdoll87]

The game launches fine and I'm able to open the default maps, but trying to open a tf2 map always results in the game crashing. Here's the error report... (thanks for any help/advice!)

Process: hl2_osx [11917]
Path: /Users/USER/Library/Application Support/Steam/*/hl2_osx
Identifier: hl2_osx
Version: ???
Code Type: X86 (Native)
Parent Process: steam_osx [11397]
Responsible: steam_osx [11397]
User ID: 501

Date/Time: 2016-09-04 00:41:28.474 -0400
OS Version: Mac OS X 10.9.5 (13F1808)
Report Version: 11
Anonymous UUID: 997F8641-28AB-60E0-BB7E-3C4CB69E09F2

Sleep/Wake UUID: D3CA7D18-6A67-47A0-99C3-FA795E3E7D43

Crashed Thread: 0 AwesomiumBrowserMain Dispatch queue: com.apple.main-thread

Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000

Thread 0 Crashed:: AwesomiumBrowserMain Dispatch queue: com.apple.main-thread
0 Awesomium 0x1d9b13a1 mac_plugin_interposing::GetPluginWindowHasFocus(void*) + 1671489
1 libsystem_malloc.dylib 0x9550c3f5 szone_error + 237
2 libsystem_malloc.dylib 0x9550684b allocate_pages + 330
3 libsystem_malloc.dylib 0x9550bd95 large_malloc + 400
4 libsystem_malloc.dylib 0x955110ac szone_malloc_should_clear + 255
5 libsystem_malloc.dylib 0x95506b6a szone_malloc + 24
6 Awesomium 0x1d9b1da1 mac_plugin_interposing::GetPluginWindowHasFocus(void*) + 1674049
7 libsystem_malloc.dylib 0x9551355b malloc_zone_malloc + 75
8 libsystem_malloc.dylib 0x95513f44 malloc + 52
9 engine.dylib 0x04d092ec Mod_LoadGameLump(int, void*, int) + 476
10 engine.dylib 0x04bd422f CEngineClient::LoadGameLump(int, void*, int) + 31
11 client.dylib 0x1cae21bf CDetailObjectSystem::LevelInitPreEntity() + 799
12 client.dylib 0x1c87e70a InvokeMethod(void (IGameSystem::*)(), char const*) + 202
13 client.dylib 0x1c87e885 IGameSystem::LevelInitPreEntityAllSystems(char const*) + 117
14 client.dylib 0x1c9e0787 CHLClient::LevelInitPreEntity(char const*) + 231
15 engine.dylib 0x04bd914e CClientState::SetSignonState(int, int) + 542
16 engine.dylib 0x04bb9e3d CBaseClientState::ProcessSignonState(NET_SignonState*) + 157
17 engine.dylib 0x04bb9f2b non-virtual thunk to CBaseClientState::ProcessSignonState(NET_SignonState*) + 27
18 engine.dylib 0x04b32bd8 NET_SignonState::Process() + 24
19 engine.dylib 0x04d213f1 CNetChan::ProcessMessages(bf_read&) + 1041
20 engine.dylib 0x04d219eb CNetChan::CheckReceivingList(int) + 363
21 engine.dylib 0x04d22495 CNetChan::ProcessPacket(netpacket_s*, bool) + 837
22 engine.dylib 0x04d279b3 NET_ProcessSocket(int, IConnectionlessPacketHandler*) + 787
23 engine.dylib 0x04bfeba6 CL_ReadPackets(bool) + 454
24 engine.dylib 0x04cb522f _Host_RunFrame_Client(bool) + 159
25 engine.dylib 0x04cb666f _Host_RunFrame(float) + 1887
26 engine.dylib 0x04ccfe19 CHostState::State_Run(float) + 265
27 engine.dylib 0x04ccf18f CHostState::FrameUpdate(float) + 383
28 engine.dylib 0x04ccf005 HostState_Frame(float) + 37
29 engine.dylib 0x04da3359 CEngine::Frame() + 905
30 engine.dylib 0x04da0289 CEngineAPI::MainLoop() + 201
31 engine.dylib 0x04da0da9 CModAppSystemGroup::Main() + 217
32 engine.dylib 0x04dfafae CAppSystemGroup::Run() + 46
33 engine.dylib 0x04da06e9 CEngineAPI::RunListenServer() + 105
34 launcher.dylib 0x005440fa CSourceAppSystemGroup::Main() + 26
35 launcher.dylib 0x0054f3ee CAppSystemGroup::Run() + 46
36 launcher.dylib 0x0055933b CSteamApplication::Main() + 43
37 launcher.dylib 0x0054f3ee CAppSystemGroup::Run() + 46
38 launcher.dylib 0x00556845 ValveCocoaMain + 277
39 launcher.dylib 0x005447d1 LauncherMain + 1105
40 hl2_osx 0x00001dd5 start + 53

Thread 1:: Dispatch queue: com.apple.libdispatch-manager
0 libsystem_kernel.dylib 0x96f98992 kevent64 + 10
1 libdispatch.dylib 0x9c169899 _dispatch_mgr_invoke + 238
2 libdispatch.dylib 0x9c169532 _dispatch_mgr_thread + 52

Thread 2:
0 libsystem_kernel.dylib 0x96f977ca __psynch_cvwait + 10
1 libsystem_pthread.dylib 0x91394d1d _pthread_cond_wait + 728
2 libsystem_pthread.dylib 0x91396c25 pthread_cond_timedwait$UNIX2003 + 71
3 libtier0.dylib 0x000400b0 CThreadSyncObject::Wait(unsigned int) + 320
4 libtier0.dylib 0x00040298 CThreadEvent::Wait(unsigned int) + 24
5 filesystem_stdio.dylib 0x046a7826 CFileTracker2::ThreadedProcessMD5Requests() + 134
6 filesystem_stdio.dylib 0x046a7791 ThreadStubProcessMD5Requests(void*) + 17
7 libtier0.dylib 0x0003fcd1 ThreadProcConvert(void*) + 33
8 libsystem_pthread.dylib 0x913925fb _pthread_body + 144
9 libsystem_pthread.dylib 0x91392485 _pthread_start + 130
10 libsystem_pthread.dylib 0x91397cf2 thread_start + 34

Thread 3:
0 libsystem_kernel.dylib 0x96f977ca __psynch_cvwait + 10
1 libsystem_pthread.dylib 0x91394d1d _pthread_cond_wait + 728
2 libsystem_pthread.dylib 0x91396c25 pthread_cond_timedwait$UNIX2003 + 71
3 libtier0.dylib 0x000400b0 CThreadSyncObject::Wait(unsigned int) + 320
4 libtier0.dylib 0x00040298 CThreadEvent::Wait(unsigned int) + 24
5 libvstdlib.dylib 0x00061acf CJobThread::Run() + 399
6 libtier0.dylib 0x000413a6 CThread::ThreadProc(void*) + 278
7 libsystem_pthread.dylib 0x913925fb _pthread_body + 144
8 libsystem_pthread.dylib 0x91392485 _pthread_start + 130
9 libsystem_pthread.dylib 0x91397cf2 thread_start + 34

Thread 4:: IOPollingHelperThread
0 libsystem_kernel.dylib 0x96f98976 kevent + 10
1 steamclient.dylib 0x09f5acd2 OSXHelpers::CIOPollingHelper::RealRun() + 210
2 libtier0_s.dylib 0x0b0c68c3 CatchAndWriteContext_t::Invoke() + 159
3 libtier0_s.dylib 0x0b0c620b CatchAndWriteMiniDump_Impl(CatchAndWriteContext_t&) + 214
4 libtier0_s.dylib 0x0b0c62f2 CatchAndWriteMiniDumpExForVoidPtrFn + 87
5 libtier0_s.dylib 0x0b0c631b CatchAndWriteMiniDumpForVoidPtrFn + 35
6 steamclient.dylib 0x09f5abef OSXHelpers::CIOPollingHelper::Run() + 41
7 libtier0_s.dylib 0x0b0caf7a SteamThreadTools::CThread::ThreadExceptionWrapper(void*) + 16
8 libtier0_s.dylib 0x0b0c68c3 CatchAndWriteContext_t::Invoke() + 159
9 libtier0_s.dylib 0x0b0c620b CatchAndWriteMiniDump_Impl(CatchAndWriteContext_t&) + 214
10 libtier0_s.dylib 0x0b0c62f2 CatchAndWriteMiniDumpExForVoidPtrFn + 87
11 libtier0_s.dylib 0x0b0c631b CatchAndWriteMiniDumpForVoidPtrFn + 35
12 libtier0_s.dylib 0x0b0caeee SteamThreadTools::CThread::ThreadProc(void*) + 238
13 libsystem_pthread.dylib 0x913925fb _pthread_body + 144
14 libsystem_pthread.dylib 0x91392485 _pthread_start + 130
15 libsystem_pthread.dylib 0x91397cf2 thread_start + 34

Thread 5:
0 libsystem_kernel.dylib 0x96f977ca __psynch_cvwait + 10
1 libsystem_pthread.dylib 0x91394d1d _pthread_cond_wait + 728
2 libsystem_pthread.dylib 0x91396c25 pthread_cond_timedwait$UNIX2003 + 71
3 libtier0.dylib 0x000400b0 CThreadSyncObject::Wait(unsigned int) + 320
4 libtier0.dylib 0x00040298 CThreadEvent::Wait(unsigned int) + 24
5 libvstdlib.dylib 0x00061abb CJobThread::R