QPainter::drawText crashes in Windows (linux not tested) when used from non QT application

QPainter::drawtext crash when trying to use it within a dll linked from a NON QT application. If I test it against a QT application it works fine.

QPainter created on QImage (successfully)
QFont assigned to the QPainter (successfully)
QPainter::drawRect works (successfully)
QPainter::drawText crashes

Attached you can find a simple example of the bug. The ZIP file contains a DLL written in C++ (using QTCreator and QT 4.5.2) and a vba code (used through excel) to link and run the dll.

this is the VBA for those who can't get access to Excel

Private Declare Sub CreateABlankJPGwithSomeText Lib "S:\QTBugReportTest\release\QTBugReportTest" Alias "CreateABlankJPGwithSomeText@8" (ByVal filename As String, ByVal sometext As String)
Private Declare Sub CreateABlankJPGwithSomeRect Lib "S:\QTBugReportTest\release\QTBugReportTest" Alias "CreateABlankJPGwithSomeRect@4" (ByVal filename As String)
'
Public Sub Doit()
'
' this one crashes
' Call CreateABlankJPGwithSomeText("C:\File.jpg", "Ciao")

' this one works
Call CreateABlankJPGwithSomeRect("C:\File2.jpg")

'
End Sub