We have problems with QWebEngineView on Windows 7 if an aero theme is enabled (default). Once the QWebEngineView is being rendered, the whole window is rendered in a wrong scale. When switching to a basic theme everything is being rendered as expected.

Switching to a basic windows theme works as expected.

Simpe testcase I used in a phyton script using PyQt5 and QWebEngineView:

import sys
from PyQt5.QtCore import *
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWebEngineWidgets import QWebEngineView, QWebEngineSettings

app = QApplication(sys.argv)
web = QWebEngineView()
web.load(QUrl("https://www.qt.io/"))
web.show()

sys.exit(app.exec_())

Einvironment:

• Windows 7 64
  • dxdiag:
    Card name: Intel(R) HD Graphics 520
    Current Mode: 1600 x 900 (32 bit) (60Hz)
    Native Mode: 1920 x 1080(p) (60.049Hz)
    Driver Name: igdumdim64.dll,igd10iumd64.dll,igd10iumd64.dll,igdumdim32,igd10iumd32,igd10iumd32
    Driver Version: 21.20.16.4664
• Phyton 3.5.3 64bit
  • PyQt5==5.9.2

aero theme (see missing part at the top):

basic theme: