QT 5.6.1 Designer x64 not launching

Question

I installed QT 5.6.1 x64 toolset (using qt-opensource-windows-x86-msvc2015_64-5.6.1-1 setup file) on the PC using Windows 10 Pro x64. It seems to QT Designer (.../bin/designer.exe) is not starting. It is in task manager process list (with 0% CPU and 12 MB memory using) but nothing is shown (no windows, splashes etc).

QT Designer from QT 5.1.1 x86 toolset works properly.

Should I need QT 5.6.1 x86 toolset to use QT Designer tool? Or there is another way?

The same problem is using QT 5.7 x64

Answer 1

Yeah, I just deleted (move to another directory works too :) ):

• Qt5WebEngineWidgets.dll.
• Qt5WebEngineWidgetsd.dll
• Qt5WebEngineWidgetsd.pdb

And QT Designer starts and works fine.

Sure, it's a temporary solution. Bug had been reported before. Will wait for solution.

Answer 2

I have run in to the same issue. After some searching I found that it's a bug that is still open: https://bugreports.qt.io/browse/QTBUG-53984

The bug report mentions to "remove" Qt5WebEngineWidgets.dll. Doing so seemed to fix it for me, but obviously it's a good idea to keep an eye on this bug report for when it gets fixed.