Loading the URL "web.de" in the demo browser example crashes the WebEngine rendering process. It finishes successfully in release mode, but crashes when using a debug build. Tested with 5.8 RC msvc 2015 32 bit binaries and own compiled versions of 5.8.
The page loads fine in debug and release builds of 5.7.

Debug output:
++++++++++++++
QML debugging is enabled. Only use this in a safe environment.
[12416:15276:0109/104236:ERROR:dxva_video_decode_accelerator_win.cc(395)] EGL_EXT_device_query missing
js: A Parser-blocking, cross-origin script, https://ad11.adfarm1.adition.com/lt?wpt=j&nw=42&lt=portal(webde)category(homepage)section(homepage)tagid(available)layoutclass(b)&ac=1&wi=8609248496&ref=&os=-1&browser=-1&screen_res=184&iframe=0&fvers=&external_uid=&uid_stable=&optout=0&prf%5Bportal%5D=webde&prf%5Bcategory%5D=homepage&prf%5Bsection%5D=homepage&prf%5Btagid%5D=available&prf%5Blayoutclass%5D=b&prf%5Bdeviceclass%5D=b&prf%5Bdeviceclient%5D=browser&prf%5Bos%5D=-1&prf%5Bbrowser%5D=-1&prf%5Bscreen_res%5D=184&prf%5Biframe%5D=0&prf%5Bfvers%5D=&prf%5Bsysv%5D=%3F&prf%5Bcl%5D=chr&prf%5Bclv%5D=2&prf%5Bvpw%5D=1920&prf%5Bnet%5D=unknown&prf%5Bexternal_uid%5D=&prf%5Bhid%5D=&prf%5Bnguserid%5D=&prf%5Buids%5D=&prf%5Boptout%5D=0&prf%5Btoolbar%5D=0&prf%5Bbrandedbrowser%5D=0&prf%5Bpos%5D=1, is invoked via document.write. This may be blocked by the browser if the device has poor network connectivity.
[12416:14224:0109/104249:INFO:CONSOLE(12901)] "A Parser-blocking, cross-origin script, https://ad11.adfarm1.adition.com/lt?wpt=j&nw=42&lt=portal(webde)category(homepage)section(homepage)tagid(available)layoutclass(b)&ac=1&wi=8609248496&ref=&os=-1&browser=-1&screen_res=184&iframe=0&fvers=&external_uid=&uid_stable=&optout=0&prf%5Bportal%5D=webde&prf%5Bcategory%5D=homepage&prf%5Bsection%5D=homepage&prf%5Btagid%5D=available&prf%5Blayoutclass%5D=b&prf%5Bdeviceclass%5D=b&prf%5Bdeviceclient%5D=browser&prf%5Bos%5D=-1&prf%5Bbrowser%5D=-1&prf%5Bscreen_res%5D=184&prf%5Biframe%5D=0&prf%5Bfvers%5D=&prf%5Bsysv%5D=%3F&prf%5Bcl%5D=chr&prf%5Bclv%5D=2&prf%5Bvpw%5D=1920&prf%5Bnet%5D=unknown&prf%5Bexternal_uid%5D=&prf%5Bhid%5D=&prf%5Bnguserid%5D=&prf%5Buids%5D=&prf%5Boptout%5D=0&prf%5Btoolbar%5D=0&prf%5Bbrandedbrowser%5D=0&prf%5Bpos%5D=1, is invoked via document.write. This may be blocked by the browser if the device has poor network connectivity.", source: https://js.ui-portal.de/homepage/cs/65/1.4/webde/home/homepage.js (12901)
js: A Parser-blocking, cross-origin script, https://ad11.adfarm1.adition.com/lt?wpt=j&nw=42&lt=portal(webde)category(homepage)section(homepage)tagid(available)layoutclass(b)&ac=1&wi=8609248496&ref=&os=-1&browser=-1&screen_res=184&iframe=0&fvers=&external_uid=&uid_stable=&optout=0&prf%5Bportal%5D=webde&prf%5Bcategory%5D=homepage&prf%5Bsection%5D=homepage&prf%5Btagid%5D=available&prf%5Blayoutclass%5D=b&prf%5Bdeviceclass%5D=b&prf%5Bdeviceclient%5D=browser&prf%5Bos%5D=-1&prf%5Bbrowser%5D=-1&prf%5Bscreen_res%5D=184&prf%5Biframe%5D=0&prf%5Bfvers%5D=&prf%5Bsysv%5D=%3F&prf%5Bcl%5D=chr&prf%5Bclv%5D=2&prf%5Bvpw%5D=1920&prf%5Bnet%5D=unknown&prf%5Bexternal_uid%5D=&prf%5Bhid%5D=&prf%5Bnguserid%5D=&prf%5Buids%5D=&prf%5Boptout%5D=0&prf%5Btoolbar%5D=0&prf%5Bbrandedbrowser%5D=0&prf%5Bpos%5D=1, is invoked via document.write. This may be blocked by the browser if the device has poor network connectivity.
[12416:14224:0109/104249:INFO:CONSOLE(12901)] "A Parser-blocking, cross-origin script, https://ad11.adfarm1.adition.com/lt?wpt=j&nw=42&lt=portal(webde)category(homepage)section(homepage)tagid(available)layoutclass(b)&ac=1&wi=8609248496&ref=&os=-1&browser=-1&screen_res=184&iframe=0&fvers=&external_uid=&uid_stable=&optout=0&prf%5Bportal%5D=webde&prf%5Bcategory%5D=homepage&prf%5Bsection%5D=homepage&prf%5Btagid%5D=available&prf%5Blayoutclass%5D=b&prf%5Bdeviceclass%5D=b&prf%5Bdeviceclient%5D=browser&prf%5Bos%5D=-1&prf%5Bbrowser%5D=-1&prf%5Bscreen_res%5D=184&prf%5Biframe%5D=0&prf%5Bfvers%5D=&prf%5Bsysv%5D=%3F&prf%5Bcl%5D=chr&prf%5Bclv%5D=2&prf%5Bvpw%5D=1920&prf%5Bnet%5D=unknown&prf%5Bexternal_uid%5D=&prf%5Bhid%5D=&prf%5Bnguserid%5D=&prf%5Buids%5D=&prf%5Boptout%5D=0&prf%5Btoolbar%5D=0&prf%5Bbrandedbrowser%5D=0&prf%5Bpos%5D=1, is invoked via document.write. This may be blocked by the browser if the device has poor network connectivity.", source: https://js.ui-portal.de/homepage/cs/65/1.4/webde/home/homepage.js (12901)
js: A Parser-blocking, cross-origin script, https://ad11.adfarm1.adition.com/lt?wpt=j&nw=42&lt=portal(webde)category(homepage)section(homepage)tagid(billboard)layoutclass(b)&ac=2&wi=8609248496&ref=&os=-1&browser=-1&screen_res=184&iframe=0&fvers=&external_uid=&uid_stable=&optout=0&prf%5Bportal%5D=webde&prf%5Bcategory%5D=homepage&prf%5Bsection%5D=homepage&prf%5Btagid%5D=billboard&prf%5Blayoutclass%5D=b&prf%5Bdeviceclass%5D=b&prf%5Bdeviceclient%5D=browser&prf%5Bos%5D=-1&prf%5Bbrowser%5D=-1&prf%5Bscreen_res%5D=184&prf%5Biframe%5D=0&prf%5Bfvers%5D=&prf%5Bsysv%5D=%3F&prf%5Bcl%5D=chr&prf%5Bclv%5D=2&prf%5Bvpw%5D=1920&prf%5Bnet%5D=unknown&prf%5Bexternal_uid%5D=&prf%5Bhid%5D=&prf%5Bnguserid%5D=&prf%5Buids%5D=&prf%5Boptout%5D=0&prf%5Btoolbar%5D=0&prf%5Bbrandedbrowser%5D=0&prf%5Bpos%5D=1&prf%5Bbusterid%5D=1891088, is invoked via document.write. This may be blocked by the browser if the device has poor network connectivity.
[12416:14224:0109/104249:INFO:CONSOLE(12901)] "A Parser-blocking, cross-origin script, https://ad11.adfarm1.adition.com/lt?wpt=j&nw=42&lt=portal(webde)category(homepage)section(homepage)tagid(billboard)layoutclass(b)&ac=2&wi=8609248496&ref=&os=-1&browser=-1&screen_res=184&iframe=0&fvers=&external_uid=&uid_stable=&optout=0&prf%5Bportal%5D=webde&prf%5Bcategory%5D=homepage&prf%5Bsection%5D=homepage&prf%5Btagid%5D=billboard&prf%5Blayoutclass%5D=b&prf%5Bdeviceclass%5D=b&prf%5Bdeviceclient%5D=browser&prf%5Bos%5D=-1&prf%5Bbrowser%5D=-1&prf%5Bscreen_res%5D=184&prf%5Biframe%5D=0&prf%5Bfvers%5D=&prf%5Bsysv%5D=%3F&prf%5Bcl%5D=chr&prf%5Bclv%5D=2&prf%5Bvpw%5D=1920&prf%5Bnet%5D=unknown&prf%5Bexternal_uid%5D=&prf%5Bhid%5D=&prf%5Bnguserid%5D=&prf%5Buids%5D=&prf%5Boptout%5D=0&prf%5Btoolbar%5D=0&prf%5Bbrandedbrowser%5D=0&prf%5Bpos%5D=1&prf%5Bbusterid%5D=1891088, is invoked via document.write. This may be blocked by the browser if the device has poor network connectivity.", source: https://js.ui-portal.de/homepage/cs/65/1.4/webde/home/homepage.js (12901)
js: A Parser-blocking, cross-origin script, https://ad11.adfarm1.adition.com/lt?wpt=j&nw=42&lt=portal(webde)category(homepage)section(homepage)tagid(billboard)layoutclass(b)&ac=2&wi=8609248496&ref=&os=-1&browser=-1&screen_res=184&iframe=0&fvers=&external_uid=&uid_stable=&optout=0&prf%5Bportal%5D=webde&prf%5Bcategory%5D=homepage&prf%5Bsection%5D=homepage&prf%5Btagid%5D=billboard&prf%5Blayoutclass%5D=b&prf%5Bdeviceclass%5D=b&prf%5Bdeviceclient%5D=browser&prf%5Bos%5D=-1&prf%5Bbrowser%5D=-1&prf%5Bscreen_res%5D=184&prf%5Biframe%5D=0&prf%5Bfvers%5D=&prf%5Bsysv%5D=%3F&prf%5Bcl%5D=chr&prf%5Bclv%5D=2&prf%5Bvpw%5D=1920&prf%5Bnet%5D=unknown&prf%5Bexternal_uid%5D=&prf%5Bhid%5D=&prf%5Bnguserid%5D=&prf%5Buids%5D=&prf%5Boptout%5D=0&prf%5Btoolbar%5D=0&prf%5Bbrandedbrowser%5D=0&prf%5Bpos%5D=1&prf%5Bbusterid%5D=1891088, is invoked via document.write. This may be blocked by the browser if the device has poor network connectivity.
[12416:14224:0109/104249:INFO:CONSOLE(12901)] "A Parser-blocking, cross-origin script, https://ad11.adfarm1.adition.com/lt?wpt=j&nw=42&lt=portal(webde)category(homepage)section(homepage)tagid(billboard)layoutclass(b)&ac=2&wi=8609248496&ref=&os=-1&browser=-1&screen_res=184&iframe=0&fvers=&external_uid=&uid_stable=&optout=0&prf%5Bportal%5D=webde&prf%5Bcategory%5D=homepage&prf%5Bsection%5D=homepage&prf%5Btagid%5D=billboard&prf%5Blayoutclass%5D=b&prf%5Bdeviceclass%5D=b&prf%5Bdeviceclient%5D=browser&prf%5Bos%5D=-1&prf%5Bbrowser%5D=-1&prf%5Bscreen_res%5D=184&prf%5Biframe%5D=0&prf%5Bfvers%5D=&prf%5Bsysv%5D=%3F&prf%5Bcl%5D=chr&prf%5Bclv%5D=2&prf%5Bvpw%5D=1920&prf%5Bnet%5D=unknown&prf%5Bexternal_uid%5D=&prf%5Bhid%5D=&prf%5Bnguserid%5D=&prf%5Buids%5D=&prf%5Boptout%5D=0&prf%5Btoolbar%5D=0&prf%5Bbrandedbrowser%5D=0&prf%5Bpos%5D=1&prf%5Bbusterid%5D=1891088, is invoked via document.write. This may be blocked by the browser if the device has poor network connectivity.", source: https://js.ui-portal.de/homepage/cs/65/1.4/webde/home/homepage.js (12901)
Render process exited with code -2147483645 (crashed)