https://bugs.winehq.org/show_bug.cgi?id=43319
--- Comment #15 from plata@mailbox.org --- In case you need CEF debug output to investigate this (for Uplay): It's possible to use the CEF command line parameters (see "CefSettings" on https://bitbucket.org/chromiumembedded/cef/wiki/GeneralUsage) with upc.exe.
So for example: wine upc.exe --log-file=cef.log --log-severity=verbose