It may be related to SameSite feature which came with recent chromium (link). It can break logins to pages where login state is based on cross-site cookies.
You can try to disable opera://flags/#same-site-by-default-cookies and see if it helps.
Best posts made by edyp87
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Opera GXRE: [Solved]Cant sign in to website using Opera GX
Latest posts made by edyp87
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Opera GXRE: [Solved]Cant sign in to website using Opera GX
It may be related to SameSite feature which came with recent chromium (link). It can break logins to pages where login state is based on cross-site cookies.
You can try to disable opera://flags/#same-site-by-default-cookies and see if it helps.