Anyone has any idea?

These messages aren't critical, you can ignore them. What's important is, that you don't crash the application anymore.

The problem is the same as in your other thread: you need to take care of the destruction order of your qobjects.

resolved !!
i've chenged

m_pNetworkAccessManager->get(request);

by

request.setRawHeader("Content-Type", "application/x-www-form-urlencoded"); QByteArray par=""; m_pNetworkAccessManager->post(request,par);

I had the same question as you,I think ,maybe your project is short of the '.js' file.
You can add the '.js' file to the project-resource , then have a try.

By the way ,In my project , It has the ',js' file,but there is still a quetion.
In my projtct,I want load a HTML that use google maps api and show maps offline ,oc course I have doemloaded the map titles .the HTML can work in any browser, such as chrome, IE ,firefox and so on,but the html doesnot work in Qt5.6.0 which I use the QWebEngineWidget class.
The error is :
js: Uncaught TypeError:google.maps.LatLng is not a function
js: Uncaught TypeError:google.maps.MAP is not a function

So,this is my question,I haven't solved。

@Hans-Dijkema I have yet to try Qt 5.7 beta, but... it seems to me like you haven't installed QtWebEngine?...

@p3c0 That worked, thanks for your help.

Hi and welcome to devnet,

If you can reproduce this easily with a minimal compilable example, you should go to the bug report system to see if it's something known. If not please consider opening a new report providing that example and the guidelines to trigger the bug.

Just an FYI, disabling network adapters (used by virtual machines) in Device Manager solved the sluggishness for me.

@ThatDud3 well, Qt 5.5 have been released, but I don't see nothing about proxy in QWebEngineSettings XD It is real problem...

AFAIK yes, but you still need a build of ffmpeg that supports h.264.

QWebEngineView use IE's proxy settings, just like google chrome