@matsumaki Normally Select all is Ctrl-A (on Windows, probably Cmd-A on Mac), so I had a thought that your Ctrl key might be sticking - but then it should apply other times too., So I'll have to side with Leo here and suggest an extension is doing it ...
Hi, did you have activate "corsaire icue" in opera gx ?
I removed link between icue and OGX in icue software to have the same state as you and reactivate corsaire icue IN OGX and it works well.
in OGX the setting part is probably named "GX light effects".
@leocg I did try, that didn't work on the moment, and after 2 days changing absolutely nothing so maybe an update happened in the background or I don't know, it just works, I seriously have no idea I didn't try anytbhing specific but it works now.
thanks