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UnityWebStream Crash

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hi,i am developing a pc game using Unity3.5.7 .Recently,unity crashes occasionally, i have the stack trace for you to look at (filename not available):fastcopy_I (filename not available):_VEC_memory (filename not available):memcpy_s (filename not available):std::basic_string,stl_allocator>::assign (filename not available):std::allocator::construc t (filename not available):std::_Uninit_copy> (filename not available):std::vector>::_Unmove (filename not available):std::vector>::_Insert_n (filename not available):std::vector>::insert (filename not available):std::vector>:ush_back (filename not available):CompressedFileStreamMemory::AddFile (filename not available):FileStream::ParseDirectoryHeaders (filename not available):CompressedFileStreamMemory::LoadFiles (filename not available):UnityWebStream::UpdateProgress (filename not available):UnityWebStream::UpdateAllUnityWebStream s (filename not available):PerformMainLoop (filename not available):MainMessageLoop (filename not available):WinMain (filename not available):_tmainCRTStartup (filename not available):RegisterWaitForInputId the error.log shows: xxx.exe caused an access violation(0x0000005) 62% memory in use 3072 MB physical memory [1145 MB free]. 0 MB paging file [2112 MB free] 2048 MB user address space [885 MB free]. Read from location 31d31000 caused an access violation. so i have some questions for this 1.It seems unity is saving something , but the original memory is not available , and the wild pointers caused the crash? 2.What kind of SavedRegister is?I suspect that some downloaded data is freed,and unity try to save it,but i don't know what kind of data i should not free. 3.Can multi thread caused this? my own thread does not touch any unity memory data. the crash happened occasionally,i can't reproduce it whick bother me so much. i need your help to resolved it or avoid this. Any advice would be appreciated,thanks in advance.

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