Any idea why I get this error when clicking on thumbnail attachments in forum posts?

[pgam]

Any idea why I get this error when clicking on thumbnail attachments in forum posts?

[olek]

Hey! Looks like the problem could be due to a broken thumbnail link or an upload issue. Sometimes browser blockers (like pop-up blockers) can cause these errors too. Try refreshing the page and check your browser settings.

And if that doesn’t help, maybe check if other people are having the same issue. Sometimes these errors happen if the forum hasn’t been updated properly.