QSettings issue mingw32 vs. msvc

Got access error when writing to a key in the registry, but only when my application is build with msvc (2013, havent tried others)
If the application is build with mingw32 everything works as expected.
The framework is the prebuild versions. 5.5.1 and 5.7.0

Attached sample output:

mingw32 - Output:
Getting MyNewPort value:COM2
Setting MyNewPort=COM2 status:0 <- Success
Getting MyNewPort value:COM2

msvc - Output:
Getting MyNewPort value:default <- Failed reading also
Setting MyNewPort=COM2 status:1 <- Failed writing
Getting MyNewPort value:default <- Failed reading also

Others have tested also, see:
http://forum.qt.io/topic/70102/qsettings-issue-mingw32-vs-msvc/2