You have found it!
The "Default" profile causes it.
Selecting the "scRGB linear" profile or the "sRGB" profile fixes it, at least on my SyncMaster 245T connected via DVI-D.
Obviously, I have tested it with a clean profile, too.
Well, I noticed it after upgrading to Windows 1803, version 10.0.17134.191, but I do not know when it started, but it is evidently present in both 55.0.2994.23 and 55.0.2994.20 versions of Opera.
Driver version: 398.36 WHQL (18.104.22.16836) – currently the latest; reinstalled during the Windows upgrade.
I had not noticed any such yellow tinge before the upgrade, even with the very same drivers.
AMD Athlon X4 845;
Scythe Orochi SCORC-1100 Rev. B;
Microstar A88X-G41 PC Mate V2 + NVMe DXE;
Mushkin Enhanced Redline 997104 16 GB (2 x 8 GB) PC3-14900 9-9-9-27 1866MHz 1,5 V;
Palit GeForce GTX 1050 Ti KalmX;
Syba I/O Crest VT6330 PCI-Express 2x Firewire + 1x IDE;
Intel Optane 900p 280GB SSDPED1D280GASX;
EVGA Supernova G2 750W;
Corsair Obsidian 700D + CC800D-USB3KIT Front Panel USB 3.0 Upgrade Kit;
Samsung SyncMaster 245T (made in Slovakia).
This is just a temporary, improvised build concocted from scrap, leftover and temporarily unused parts in order to put the surplus monitor to some use, for browsing the internet, reading articles, browsing photographs, etc.; originally intended as a media center, for watching movies or live TV broadcasting from bed, due to its passive cooling.
It does not get used very often, only sometimes on weekends. But a change like this gets noticed immediately.