From an email of Mikhail:
I've fixed mysterious qt issue with QLibrary load
this bug: https://bugreports.qt.io/browse/QTBUG-52954
is very actual for 10 may Qt 5.6.1 build and nvidia on windows
to resolve this I've made what issue creator suggested and it's really helped me
Just adding QOpengl context initialization to MitkCoreApplication magically resolves it, without this patch MITK won't start for me.