can't close my casement window

Please see our 39-031 and 39-032, these look to match. I would just confirm that the dimensions are the same.

Ah, I see. Thanks for clarifying! The theory our representative has sounds like it may be the case, actually. If the dimensions are identical to the 39-156, then you definitely want to stick with that. Unfortunately, the the original installers flubbed the positioning, you will have to reposition it yourself. The easy part will be moving the connecting bracket and track over on the sash, that will just require drilling new holes (careful not to hit the glass).

The difficult part will be the trim that goes over the operator. You may need a new one cut for you. A local carpenter should be able to help out.

Looking at your photos, it appears that the smaller arm which attaches to the sash bracket is too short. I think I'm leaning towards Tom's original suggestion; you might need the 39-032 operator. The larger link arm may allow you to avoid any major alterations. That said, I'd like to see the original operator you had installed in the window, if you still have it, side by side with the 39-155 in your first pictures.

This sure is a weird one. We have a couple different guys looking at it right now, actually, and one of them mentioned he has this same window at home. Looking at your setup and thinking back on what he has, he thinks your first step would be to disconnect everything, including the track. Make sure that the operator arms are set in the position it would be in assuming the sash is fully closed. Then, it will just be a matter of trial and error, lining it up with the sash until the arms are able to close the proper way. Ultimately, you'll want to adjust the operator, track, and bracket more to the right; right now it's all far too close to the left. We also believe you will need to push it closer to the sill. However, like I mentioned, it's going to take trial and error until you get it in the right position.