After upgrading to win10, reinstalling stuff like (Microsoft) Visual Studio, the Gideros player stopped working. All the other exes worked fine. This happened in windows 10 home and pro.
I found that it was because of the QT 5.5 DLL files.
5.5 only had partial win10 support but 5.6 has full support.
I downloaded the latest QT 5.6 and copied over the new versions of the Qt*.dll files and now the Player works.
So, here's hoping the next release uses the upgraded QT 5.6.