// Do an application frame
void CRuntime::PostFrame(bool present):   (Runtime/MainLoop.cpp)
    ...
    RunEventList();
    ...

        |
        v

void CRuntime::RunEventList():   (Runtime/MainLoop.cpp)
    list<CRunLayout*>::iterator f = runningFrames.begin();
    ...
    // Unload old frame
    (*f)->Unload();
    // Replace this running frame
    *f = pNewFrame;
    changeFrame = -1;
    (*f)->Load();   <-------
    ...

        |
        v

void CRunLayout::Load():   (Runtime/Textures.cpp)
    ...
    LoadLayoutTextures();

        |
        v

void CRunLayout::LoadLayoutTextures():   (Runtime/Textures.cpp)
    ImageHandleIterator i = used_image_handles.begin();
    ImageHandleIterator end = used_image_handles.end();
    for ( ; i != end; ++i) {
        // Not in VRAM: create it (textures are created with 0 references)
        if (!(*i)->IsInVRAM(pRuntime->renderer))
            (*i)->TransferToVRAM(pRuntime->renderer);    <-------

        // This layout now references this texture
        (*i)->th->IncrementReferences();    <------- Краш, т.к. th == NULL
    }
    ...

        |
        v

void ImageHandleInfo::TransferToVRAM(Renderer& renderer):   (Runtime/Textures.cpp)
    ...
    th = renderer.CreateTextureFromFileInMemory(pngFile, pngFileSize);

        |
        v

TextureHandle CDX9Renderer::CreateTextureFromFileInMemory(LPCVOID pData, uint len, texture_format format, bool premultiply):   (Common/Renderers/CDX9Renderer.cpp)
    // Can't call during lost device
    if (device_is_lost)
        return NULL;  <------
    ...