Hi Chohole…I’ve never come across such a problem so I’m a little curious about it. First, let me ask: is this a “TIFF” file? Second: Are you getting a “Pixel aspect ratio correction is for preview purposes only. Turn it off for maximum image quality.” message? In my search for a solution to your problem I came up with these links:

http://www.graphicdesignforum.com/forum/archive/index.php/t-1282.html

At this link scroll down to “PS_User” post for a possible work around.

http://www.videouniversity.com/articles/photoshop-for-video-tips-and-tricks

At this link scroll down to section: lll. Tips for viewing Pixel Aspect Ratios:

http://www.tek-tips.com/viewthread.cfm?qid=1234004&page=1

Here look at both “Blueark” posts

Basically try going: Image>Pixel Aspect Ratio>Square and fiddle with this or going to “View” menu and see if “Pixel Aspect Ratio Correction” is on.

I hope I was able to help.