Weird doubled images...see attached images

[Atilla10]

I apologize for posting this topic in the wrong category. oops...

While playing the Penumbra Collection (Overture-Shaft 12)(on mac os x leopard) I
noticed this blur effect I am not sure if that's supposed to be there.

Whenever I do a right click on mouse, the images, objects, "like the
glow stick has a second blurry instance beside it) become blurry and
doubled, and when I release right click it becomes less blurry, and the
glow stick still has that blurry copy of it on right side of the glow
stick. Should that supposed to be that way or is it a bug or error
thing?

I never had that before, like last year. I started playing it yesterday
and had that thing. So, I went, maybe I should update the game, so I did
updated it. If that's part of the game and the let me know
Maybe the character, forgot his name, starting to have double vision?
It's been a year since I played it, so I opened it yesterday

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Ok, I've just captured 4 screen shots and attached them as zip.

I opened the Penumbra Collection, I didn't richt click just walked around and saw these doubled images as seen in attached images. In a place where there is a projector, I clicked right mouse and it gets more blurry and double vision. But when not clicking it shows some double images, mostly the glow stick and some other light sources or reflections.

My machine is latest mac pro 2011 with mac os x snow leopard, penumbra collection 1.1 latest.

Do you have any idea, what is it? It doesn't influence my game play at all. No problems in performance. Just those reflections/doubles/ or whatever you call it...