I've found a work around that works (so far) for me. I'm on Opera 63 and if you type "opera:flags" in the address bar you get access to some experimental settings (no guarantees!). Find the #force-color-profile setting and change it to sRGB (very rich colours on my kit) or Display P3 D65 (a more muted colour scheme). HDR settings might have some unexpected effects.

@bunjoman: I subsequently restored from a handy archive the Roaming/Opera Stable folder and files over the existing. Everything is back to the pre-tidy state. Hooray.

Was doing a little synchronisation and tidying up when I lost some extensions. I've got all of them back except Evernote Web Clipper. The extension icon appears briefly and then disappears. I can't get it back through the old Opera extension or the more modern Chrome store. The Web clipper options show the following error message:

22:48:41 GMT+0000 (Greenwich Mean Time) (WARN) /background.html: Got error: {"errorCode":5,"parameter":"authenticationToken"}. Clipper logged out
at n (/js/main/Account.js:3:3272)

Yet it still works in Firefox.

@operalinknx1

Agreed. It's worse now in v64 and the opera:flags force color doesn't seem to work. If been reading other browser posts and it seems that Chrome and Firefox also have colour problems of some sort or other.... which makes it possible that the bug lies in the chromium engine rather that Opera itself.

I've found a work around that works (so far) for me. I'm on Opera 63 and if you type "opera:flags" in the address bar you get access to some experimental settings (no guarantees!). Find the #force-color-profile setting and change it to sRGB (very rich colours on my kit) or Display P3 D65 (a more muted colour scheme). HDR settings might have some unexpected effects.