Ahhh… I think I see and unfortunately, I don’t know if UX can completely solve it. Keep in mind though, I’m not a UX person, I’m here for the community side of things.
It looks like you may have run smack dab into an issue that “plagues” many online communities. It’s when people join a community, ask their question (often without looking at older discussions for answers) and then leave. I say that even though the question in the discussion you linked doesn’t look exactly like that.
I do note that the OP of the discussion you linked has also started a new discussion, so it looks like Olga may have successfully ‘converted’ Sama into a full fledged, participating member.
From the community management side of things, I can tell you that people like Olga are the lifeblood of your community and I believe you can always expect some of the repetitive questions that you’re seeing.
I’m not saying you should give up on UX! Dollars to donuts, I’ll bet there are some UX solutions that can help you. I just want you to know that you may not be able to completely eliminate the need for these questions.
I’d also like to say that I like the concept of your community and I like the way you have the latest active discussions displayed on the right side of the screen.
I hope that helps a bit.