[Marduk2004]

Know anybody why GCS Crash at "Loading Core plugin" i have this Problem at all new compiled "next" Version. In the compiling progress is no Error and the Mingw32 is a new installation...

[f5soh]

You should wait the Msys2 Qt5 5.6.1-4 package that fixes a Qt regression using Gcc 6.xx
https://github.com/Alexpux/MINGW-packages/pull/1755

Or downgrade Gcc to 5.4

[Marduk2004]

But the 64bit works?!... How can i downgrade?

[f5soh]

yes, 64bits should works.

Maybe there is a downgrade command using pacman.
I did manually, downloaded all file with "5.4.0-1" on it, from
https://sourceforge.net/projects/msys2/files/REPOS/MINGW/i686/
mingw-w64-i686-gcc-5.4.0-1-any.pkg.tar.xz
mingw-w64-i686-gcc-ada-5.4.0-1-any.pkg.tar.xz
mingw-w64-i686-gcc-fortran-5.4.0-1-any.pkg.tar.xz
mingw-w64-i686-gcc-libgfortran-5.4.0-1-any.pkg.tar.xz
mingw-w64-i686-gcc-libs-5.4.0-1-any.pkg.tar.xz
mingw-w64-i686-gcc-objc-5.4.0-1-any.pkg.tar.xz

and installed with pacman.