RHEL-7.4 upated qt5 to 5.6.2 - please rebuild qt-creator.
it's fixed in qt-creator-4.1.0-3.el7. I will push it into update today. Thanks for your report.
qt-creator-4.1.0-3.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2017-53bf9d8d3c
qt-creator-4.1.0-3.el7 has been pushed to the Fedora EPEL 7 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2017-53bf9d8d3c
qt-creator-4.1.0-3.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.