WebEngine hangs when loaded in a plugin with Nvidia Geforce GTX 660 display adapter

I'm building Qt Creator myself on Qt 5.7.0x64 binary release on Windows 7/10 with MSVC2013/2015 and Qt Creator 4.1.0 (also earlier releases). When I start Qt Creator it hangs on startup loading its Help4.dll, which itself appears to be hanging in initalization of qtwebengine.
There is basically the same issue QTBUG-52954, which has been fixed. The difference, I think, is, that I'm having a Geforce GTX 660 (on two different systems; latest drivers).

Trace:
1 NtWaitForSingleObject ntdll 0x7761bb7a
2 WaitForSingleObjectEx KERNELBASE 0x7fefd4f10ac
3 DrvValidateVersion nvoglv64 0x694ccc32
4 DrvValidateVersion nvoglv64 0x694cc65a
5 DrvValidateVersion nvoglv64 0x694cf07e
6 DrvValidateVersion nvoglv64 0x694cd5b1
7 nvoglv64 0x694b607f
8 DrvValidateVersion nvoglv64 0x694cdb5e
9 DrvValidateVersion nvoglv64 0x694c9a9a
10 DrvSetContext nvoglv64 0x694c880b
11 MakeAnyCurrent opengl32 0x7feead1517e
12 wglMakeCurrent opengl32 0x7feead15604
13 QWindowsOpenGLTester::testDesktopGL qwindowsopengltester.cpp 371 0x7fed2a5c9b7
14 QWindowsOpenGLTester::detectSupportedRenderers qwindowsopengltester.cpp 246 0x7fed2a5be2f
15 QWindowsOpenGLTester::supportedRenderers qwindowsopengltester.cpp 298 0x7fed2a5bb78
16 QWindowsStaticOpenGLContext::doCreate qwindowsintegration.cpp 409 0x7fed29ec027
17 QWindowsStaticOpenGLContext::create qwindowsintegration.cpp 436 0x7fed29ebd79
18 QWindowsIntegration::staticOpenGLContext qwindowsintegration.cpp 470 0x7fed29eb58b
19 QWindowsIntegration::openGLModuleType qwindowsintegration.cpp 456 0x7fed29eb4ee
20 QOpenGLContext::openGLModuleType qopenglcontext.cpp 1245 0x7fed3108852
21 initialize qtwebenginewidgetsglobal.cpp 58 0x7fecdd74845
22 `anonymous namespace'::initialize_ctor_class_::initialize_ctor_class_ qtwebenginewidgetsglobal.cpp 65 0x7fecdd7487e
23 `anonymous namespace'::`dynamic initializer for 'initialize_ctor_instance_'' qtwebenginewidgetsglobal.cpp 65 0x7fecdd74400
24 _initterm crt0dat.c 955 0x7fed2c555ac
25 _CRT_INIT crtdll.c 300 0x7fecdda3b35
26 __DllMainCRTStartup crtdll.c 502 0x7fecdda3eab
27 _DllMainCRTStartup crtdll.c 473 0x7fecdda3e11
28 TpAllocTimer ntdll 0x77606a98
29 TpAllocTimer ntdll 0x7760686e
30 LdrLoadDll ntdll 0x775f5fcf
31 LoadLibraryExW KERNELBASE 0x7fefd510176
32 QLibraryPrivate::load_sys qlibrary_win.cpp 115 0x66895e6b
33 QLibraryPrivate::load qlibrary.cpp 538 0x6689291a
34 QLibraryPrivate::loadPlugin qlibrary.cpp 586 0x66892a51
35 QPluginLoader::load qpluginloader.cpp 239 0x668843aa
36 ExtensionSystem::Internal::PluginSpecPrivate::loadLibrary pluginspec.cpp 962 0x7fed9018b20
37 ExtensionSystem::Internal::PluginManagerPrivate::loadPlugin pluginmanager.cpp 1376 0x7fed9001937
38 ExtensionSystem::Internal::PluginManagerPrivate::loadPlugins pluginmanager.cpp 1213 0x7fed9000cbf
39 ExtensionSystem::PluginManager::loadPlugins pluginmanager.cpp 365 0x7fed8ffe1a0
40 main main.cpp 524 0x13fccc5d6
41 WinMain qtmain_win.cpp 123 0x13fcd29ed
42 __tmainCRTStartup crtexe.c 618 0x13fcd1e81
43 WinMainCRTStartup crtexe.c 466 0x13fcd1bfe
44 BaseThreadInitThunk kernel32 0x774c59bd
45 RtlUserThreadStart ntdll 0x775fa2e1