I've been experiencing this issue for quite some time now, possibly since last year. In the past, I was usually able to resolve it by using the GX Cleaner to clear cookies and cache, and that would fix the problem temporarily. However, starting last month, this method no longer works.

Now, whenever I try to access a specific website using Opera GX, I get an error page instead of the content loading properly. The error page displays a "FreeMarker template error", along with some Java stack trace.

It seems to be related to a missing localization message or a rendering issue in the page template, but the strange part is that this only happens in Opera GX. When I switch to Microsoft Edge, the site loads perfectly fine without any error.

I'm not sure why Opera GX is behaving this way, so I'm posting here in hopes of getting some guidance or a fix. Has anyone else encountered this, or does anyone know what might be causing it?