Editor Crash + Scene delete

Hi,
im using Unity 4.6.1 Pro on a MacBook Pro late 2013 with 8GB ram + i5.
Unity crashes about every 20 minutes when im working on my main Scene.

EDIT: Ive just confirmed that this is not because of "working" in Unity.
I had unity open on a fresh start and left the Mac. 30 min later Unity was "dead" with the console window flooded ( "UNSUPPORTED").

All meshes in editor window turn to a rainbow like color - then Unity crashes.
Worst of all - the Scene gets deleted every time. Its not in "temp" or anywhere on my Mac.
Unity seems to just "save delete" it. This makes working on my Game nearly impossible.
Im Backing up Scenes like crazy. Is there any fix for that behavior or is it a known bug?
Right now im really angry about this behavior on a software that expensive.
In addition to that i constantly get out of memory crashes on really easy tasks and unitys just using about 600-800mb of ram.
I cant even tell you if it is since the 4.6 update because a lot changes every day. But it is definitely worse since the update.

Some data:
Scene size - 18mb
Terrain:
width 2000
length 2000
height 600
height res 2049
Detail res 2048
Detail res per patch 16
control tex res 2048
base tex res 2048

Most scene objects (Rocks) have convex mesh collider.
Trees have capsule collider and 2 LODs.

 

Log as txt file.
Found this thread - this pretty much describes my problem.
But the out of memory issue is has nothing to do with this.
EDIT: Just noticed that my Scene was not deleted on this crash. thats the first time.

 

No - this is my main problem. It is exactly what happens every 20 minutes.
The other out of memory issues appear randomly on texture imports, mesh changes etc. For example i import a 1024 texture (png) and unity crashes. Then i restart it and import again and everything is just fine. I can pretty much live with that behavior. But not with unity crashing every 20 mins + trashing my scenes.

 

Just updated Yosemite and started Unity - next crash.

 

Next crash - 19 mins.
No work in unity done - i was just writing in monodev.

 

Unity crashes my Mac like this yes, also about every 20 minutes.

Sometimes I am not even at the computer, I am like opening the door for someone, and I sit down again and Unity is crashed. I have tried to just sit and read the screen with no touch of mouse or keyboard and suddently Unity crashes.

I get all the UNSUPPORTED crashes, I get all the out of momory crashes, I get those that opens the bug report window, and thoses that do not.

I am trying to tell Unity Tech that there is a major issue here, and I'm told to write in the forums, where each time I'm told that 'this is another case'..

Graham - here you see yet another tread like these - as I understand on in the other tread where you argued, there are no issues on Unity / Mac? Please, look sir, I am NOT the only one. Yes, I AM aware that there are many Ma'cs running Unity, and that apparently according to you most of them without issues. But then there are the rest of us, and it's NOT just isolated instances, we see a complete freak show of crashes all the time.

I have now submitted at least 30 bug repports, how long should this go on before you realize there is an actual isue, and you cannot just say 'this is a OSX Open GL, and this is that and this is that - overall there is a profound bug, and you need to address this.

I am trying hard to give all details on every crash - but how would you submit a bug report in details when for the 6th time before the morning coffee Unity crashed just when you pressed Play? How many details can be given? It crashes constantly!!

 

I don't know if this is related or not but on the lates Unity 4.6.1p5 (OSX 10.9.5 13F34 MBP Intel Core i7 2,6 GHz 16 GB 1024 MB MacStandaloneSupport) Editor crashes every time it has to recompile c# scripts if was in play mode before script modification.

So reproduction is:
1) Start unity and open scene with attached c# script
2) play in editor and then stop
3) edit your script and save
4) wait for unity to recompile
5) UNITY CRASHES

Editio.Log
Reloading assemblies after finishing script compilation.
Begin MonoManager ReloadAssembly
Receiving unhandled NULL exception
Launching bug reporter
Obtained 22 stack frames.
#0 0x0000000448855a in mono_class_array_element_size
#1 0x0000000072d462 in scripting_array_new(MonoClass*, unsigned long, unsigned long)
#2 0x0000000086df40 in TryVerifySignature(char const*, unsigned char const*)
#3 0x0000000086dd70 in FindAndLoadUnityPlugin(char const*)
#4 0x000000044b962e in mono_lookup_pinvoke_call
#5 0x000000044cd22e in mono_marshal_get_native_wrapper
#6 0x000000043d9803 in mono_method_to_ir
#7 0x000000043ba0b6 in mini_method_compile
#8 0x000000043bbdb3 in mono_jit_compile_method
#9 0x000000043bb77f in mono_jit_compile_method
#10 0x000000044f313c in mono_compile_method
#11 0x00000004439872 in mono_magic_trampoline
#12 0x00000005f68066 in (Unknown)
#13 0x00000010720512 in (wrapper runtime-invoke) object:runtime_invoke_virtual_void__this__ (object,intptr,intptr,intptr) + 0x92 (0x10720480 0x107205dd) [0x6f48a80 - Unity Child Domain]
#14 0x000000044a153c in mono_gc_run_finalize
#15 0x000000044a2ec1 in mono_gc_init
#16 0x0000000451f929 in mono_thread_create_internal
#17 0x00000004553334 in CreateThread
#18 0x000000045792b1 in GC_start_routine
#19 0x00000098c615fb in _pthread_body
#20 0x00000098c61485 in _pthread_struct_init
#21 0x00000098c66cf2 in thread_start

*** Launching bug reporter due to crashbug.
Obtained 27 stack frames.
0 Unity 0x016a6c61 _Z17LaunchBugReporter13BugReportMode + 1073
1 Unity 0x0095fb25 _Z12HandleSignaliP9__siginfoPv + 53
2 libmono.0.dylib 0x0447185e mono_chain_signal + 76
3 libmono.0.dylib 0x043bc926 mono_sigsegv_signal_handler + 234
4 libsystem_platform.dylib 0x983a5deb _sigtramp + 43
5 ??? 0xffffffff 0x0 + 4294967295
6 Unity 0x0072d462 _Z19scripting_array_newP9MonoClassmm + 18
7 Unity 0x0086df40 _ZL18TryVerifySignaturePKcPKh + 128
8 Unity 0x0086dd70 _Z22FindAndLoadUnityPluginPKc + 64
9 libmono.0.dylib 0x044b962e mono_lookup_pinvoke_call + 586
10 libmono.0.dylib 0x044cd22e mono_marshal_get_native_wrapper + 390
11 libmono.0.dylib 0x043d9803 mono_method_to_ir + 95999
12 libmono.0.dylib 0x043ba0b6 mini_method_compile + 2252
13 libmono.0.dylib 0x043bbdb3 mono_jit_compile_method + 1637
14 libmono.0.dylib 0x043bb77f mono_jit_compile_method + 49
15 libmono.0.dylib 0x044f313c mono_compile_method + 36
16 libmono.0.dylib 0x04439872 mono_magic_trampoline + 2184
17 ??? 0x05f68066 0x0 + 100040806
18 ??? 0x10720512 0x0 + 275907858
19 libmono.0.dylib 0x044a153c mono_gc_run_finalize + 1020
20 libmono.0.dylib 0x044a2ec1 mono_gc_init + 1135
21 libmono.0.dylib 0x0451f929 mono_thread_create_internal + 1645
22 libmono.0.dylib 0x04553334 CreateThread + 1558
23 libmono.0.dylib 0x045792b1 GC_start_routine + 108
24 libsystem_pthread.dylib 0x98c615fb _pthread_body + 144
25 libsystem_pthread.dylib 0x98c61485 _pthread_struct_init + 0
26 libsystem_pthread.dylib 0x98c66cf2 thread_start + 34

I have submited bug report 667910

Update: This issue seems to be already resolved in 4.6.2f1