Drag and drop causes Qt to crash everytime with same segmentation fault

[Sajjmon]

I got a really strange crash when going from qt4.8 to qt 5.0.1 with dragging and dropping. Everything worked fine with the old qt 4.8 but as soon as I went in to qt 5.0 it always seem to crash when dragging a file over the mainwindow.

So I started a totally clean project, created a layout within the centralwidget and then a widget inside the layout.
The widget tree like this:

Mainwindow - centralWidget - Layout - newWidget

Everytime I drag a file over the window/widgets Qt seems to load a lot of libraries to find a template, sure no problem with that (except that it takes some time). Now comes the strange part, when I drop the file (Note QWidget is totally clean, no special settings at all) the program crashes, this happens everytime and it happens when I drop the file in the window or drag the file outside the window.

It gives me a Segmantation Fault and this disassembler code everytime:

Function: lstrlenA
    0x74dcad83  <+0x0006>         jge    0x74dcad6d <lstrcpynA+112>
    0x74dcad85  <+0x0008>         sti
    0x74dcad86  <+0x0009>         roll   $0x0,(%edx)
    0x74dcad89  <+0x000c>         mov    0x8(%ebp),%eax
    0x74dcad8c  <+0x000f>         test   %eax,%eax
    0x74dcad8e  <+0x0011>         je     0x74dcadc7 <lstrlenA+74>
    0x74dcad90  <+0x0013>         andl   $0x0,-0x4(%ebp)
    0x74dcad94  <+0x0017>         lea    0x1(%eax),%edx
    0x74dcad97  <+0x001a>         mov    (%eax),%cl
    0x74dcad99  <+0x001c>         inc    %eax
    0x74dcad9a  <+0x001d>         test   %cl,%cl
    0x74dcad9c  <+0x001f>         jne    0x74dcad97 <lstrlenA+26>
    0x74dcad9e  <+0x0021>         sub    %edx,%eax
    0x74dcada0  <+0x0023>         movl   $0xfffffffe,-0x4(%ebp)
    0x74dcada7  <+0x002a>         jmp    0x74dcadc9 <lstrlenA+76>
    0x74dcada9  <+0x002c>         mov    -0x14(%ebp),%eax
    0x74dcadac  <+0x002f>         mov    (%eax),%eax
    0x74dcadae  <+0x0031>         mov    (%eax),%eax
    0x74dcadb0  <+0x0033>         xor    %ecx,%ecx
    0x74dcadb2  <+0x0035>         cmp    $0xc00000fd,%eax
    0x74dcadb7  <+0x003a>         setne  %cl
    0x74dcadba  <+0x003d>         mov    %ecx,%eax
    0x74dcadbc  <+0x003f>         ret
    0x74dcadbd  <+0x0040>         mov    -0x18(%ebp),%esp
    0x74dcadc0  <+0x0043>         movl   $0xfffffffe,-0x4(%ebp)
    0x74dcadc7  <+0x004a>         xor    %eax,%eax
    0x74dcadc9  <+0x004c>         call   0x74df6fc9 <KERNELBASE!IsNLSDefinedString+1209>
    0x74dcadce  <+0x0051>         ret    $0x4
    0x74dcadd1  <+0x0054>         int3
    0x74dcadd2  <+0x0055>         int3
    0x74dcadd3  <+0x0056>         int3
    0x74dcadd4  <+0x0057>         int3
    0x74dcadd5  <+0x0058>         int3
            Function: lstrcmpW
    0x74dcadd6  <+0x0000>         mov    %edi,%edi
    0x74dcadd8  <+0x0002>         push   %ebp
    0x74dcadd9  <+0x0003>         mov    %esp,%ebp
    0x74dcaddb  <+0x0005>         push   %esi
    0x74dcaddc  <+0x0006>         mov    0xc(%ebp),%esi
    0x74dcaddf  <+0x0009>         push   %edi
    0x74dcade0  <+0x000a>         mov    0x8(%ebp),%edi
    0x74dcade3  <+0x000d>         push   $0xffffffff
    0x74dcade5  <+0x000f>         push   %esi
    0x74dcade6  <+0x0010>         push   $0xffffffff
    0x74dcade8  <+0x0012>         push   %edi
    0x74dcade9  <+0x0013>         push   $0x0
    0x74dcadeb  <+0x0015>         push   $0x400
    0x74dcadf0  <+0x001a>         call   0x74de2e93 <KERNELBASE!CopySid>
    0x74dcadf5  <+0x001f>         test   %eax,%eax
    0x74dcadf7  <+0x0021>         jne    0x74dcae54 <lstrcmpW+126>
    0x74dcadf9  <+0x0023>         push   $0xffffffff

Function: lstrlenA
    0x74dcad83  <+0x0006>         jge    0x74dcad6d <lstrcpynA+112>
    0x74dcad85  <+0x0008>         sti
    0x74dcad86  <+0x0009>         roll   $0x0,(%edx)
    0x74dcad89  <+0x000c>         mov    0x8(%ebp),%eax
    0x74dcad8c  <+0x000f>         test   %eax,%eax
    0x74dcad8e  <+0x0011>         je     0x74dcadc7 <lstrlenA+74>
    0x74dcad90  <+0x0013>         andl   $0x0,-0x4(%ebp)
    0x74dcad94  <+0x0017>         lea    0x1(%eax),%edx
    0x74dcad97  <+0x001a>         mov    (%eax),%cl
    0x74dcad99  <+0x001c>         inc    %eax
    0x74dcad9a  <+0x001d>         test   %cl,%cl
    0x74dcad9c  <+0x001f>         jne    0x74dcad97 <lstrlenA+26>
    0x74dcad9e  <+0x0021>         sub    %edx,%eax
    0x74dcada0  <+0x0023>         movl   $0xfffffffe,-0x4(%ebp)
    0x74dcada7  <+0x002a>         jmp    0x74dcadc9 <lstrlenA+76>
    0x74dcada9  <+0x002c>         mov    -0x14(%ebp),%eax
    0x74dcadac  <+0x002f>         mov    (%eax),%eax
    0x74dcadae  <+0x0031>         mov    (%eax),%eax
    0x74dcadb0  <+0x0033>         xor    %ecx,%ecx
    0x74dcadb2  <+0x0035>         cmp    $0xc00000fd,%eax
    0x74dcadb7  <+0x003a>         setne  %cl
    0x74dcadba  <+0x003d>         mov    %ecx,%eax
    0x74dcadbc  <+0x003f>         ret
    0x74dcadbd  <+0x0040>         mov    -0x18(%ebp),%esp
    0x74dcadc0  <+0x0043>         movl   $0xfffffffe,-0x4(%ebp)
    0x74dcadc7  <+0x004a>         xor    %eax,%eax
    0x74dcadc9  <+0x004c>         call   0x74df6fc9 <KERNELBASE!IsNLSDefinedString+1209>
    0x74dcadce  <+0x0051>         ret    $0x4
    0x74dcadd1  <+0x0054>         int3
    0x74dcadd2  <+0x0055>         int3
    0x74dcadd3  <+0x0056>         int3
    0x74dcadd4  <+0x0057>         int3
    0x74dcadd5  <+0x0058>         int3
            Function: lstrcmpW
    0x74dcadd6  <+0x0000>         mov    %edi,%edi
    0x74dcadd8  <+0x0002>         push   %ebp
    0x74dcadd9  <+0x0003>         mov    %esp,%ebp
    0x74dcaddb  <+0x0005>         push   %esi
    0x74dcaddc  <+0x0006>         mov    0xc(%ebp),%esi
    0x74dcaddf  <+0x0009>         push   %edi
    0x74dcade0  <+0x000a>         mov    0x8(%ebp),%edi
    0x74dcade3  <+0x000d>         push   $0xffffffff
    0x74dcade5  <+0x000f>         push   %esi
    0x74dcade6  <+0x0010>         push   $0xffffffff
    0x74dcade8  <+0x0012>         push   %edi
    0x74dcade9  <+0x0013>         push   $0x0
    0x74dcadeb  <+0x0015>         push   $0x400
    0x74dcadf0  <+0x001a>         call   0x74de2e93 <KERNELBASE!CopySid>
    0x74dcadf5  <+0x001f>         test   %eax,%eax
    0x74dcadf7  <+0x0021>         jne    0x74dcae54 <lstrcmpW+126>
    0x74dcadf9  <+0x0023>         push   $0xffffffff

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System is: Windows 7 x64
Qt version: Qt 5.0.1 with MinGW compiler

Anyone have any idea about this, seems like a Qt bug or I'm just doing something wrong?

Edit:
Tried to build my small project in Release mode and now the drag worked fine but when in Debug mode it crashes all the time, maybe I'm missing some plugin for debugger?
Actually I saw now that I got these messages in Application Output, could they be some kind of reason:

Temporarily disabling breakpoints for unloaded shared library "C:\Qt\Qt5.0.1\5.0.1\mingw47_32\plugins\platforms\qminimald.dll"
Temporarily disabling breakpoints for unloaded shared library "C:\Qt\Qt5.0.1\5.0.1\mingw47_32\plugins\platforms\qwindowsd.dll"

Temporarily disabling breakpoints for unloaded shared library "C:\Qt\Qt5.0.1\5.0.1\mingw47_32\plugins\platforms\qminimald.dll"
Temporarily disabling breakpoints for unloaded shared library "C:\Qt\Qt5.0.1\5.0.1\mingw47_32\plugins\platforms\qwindowsd.dll"

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