Release does not run. This application failed to start - qt

Question

My application works when it built in debug mode. But it does not run in release.
This application failed to start because it could not find or load the
Qt platform plugin "windows".
Reinstalling the application may fix this problem.
I copied dlls which the application required. I copied also qwindows.dll, qoffscreen.dll and libEGL.dll.
But libEGL.dll located in C:\qt\5.3\msvc2013\bin and `C:Qt\ToolsQtCreator\bin'. I compiled my application by msvc-11.0(2012).
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I put platforms folder to exe directory and now application runs but crashes immediately in ntdll.dll!771e56bc()
Now my problem is similar to this one Why is ntdll.dll crashing my c++ executable?.
Can I make debug working like release but save debug mode?
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Here is Application Verifier result for release mode. It does not happen for debug.
=======================================
VERIFIER STOP 00000006: pid 0xDF0: Corrupted heap pointer or using wrong heap.
00161000 : Heap handle used in the call.
093F8FF8 : Heap block involved in the operation.
00000004 : Size of the heap block.
06441000 : Heap where block was originally allocated.
=======================================
This verifier stop is not continuable. Process will be terminated
when you use the `go' debugger command.
=======================================
MyApp.exe has triggered a breakpoint.
AVRF: Noncontinuable verifier stop 00000006 encountered. Terminating process ...
The thread 0x1724 has exited with code -1073740767 (0xc0000421).
The program '[3568] MyApp.exe' has exited with code -1073740767 (0xc0000421).
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Here is a top of a call stack
vrfcore.dll!6ae43466() Unknown
[Frames below may be incorrect and/or missing, no symbols loaded for vrfcore.dll]
[External Code]
qwindows.dll!0f0642cb() Unknown
qwindows.dll!0f065f8a() Unknown
qwindows.dll!0f0662bb() Unknown
Qt5Gui.dll!0f774cf3() Unknown
Qt5Gui.dll!0f774e75() Unknown
Qt5Gui.dll!0f7778d5() Unknown

Answer 1

But libEGL.dll located in C:\qt\5.3\msvc2013\bin and `C:Qt\ToolsQtCreator\bin'
You must not take any DLLs from C:\Qt\Tools\QtCreator\ -- these are private DLLs for Qt Creator, and they are incompatible with your application.
Only take DLLs from C:\Qt\5.3\msvc2013\bin and C:\Qt\5.3\msvc2013\plugins. Here is the required folder structure:
(source: http://qt-project.org/wiki/Deploy_an_Application_on_Windows )

Answer 2

This sounds like either a DLL is missing or the application expects it in a different path.
a) Use the Dependency Walker on your release build executable to check whether all DLL dependencies can be resolved.
b) Make sure that your platform plugin files are at the right location. I think they need to be in a folder called "platforms" (not absolutely sure though).
c) There is a post in the Qt forum about a similar problem. Maybe this helps you to track it down.