Movie file stretched below screen on a Mac and I can't resize it.

I opened a .mov file on my iMac and it’s stretched below the screen. When I click the green button it fits it to the screen but when I click the bottom right corner to resize it it reverts back to the stretched out size. I remember watching it without any problems before but now it’s messed up. any ideas?

What did you open it in? QuickTime Player? iTunes? VLC? Something else?

For most programs: quit the app, find the preferences file for it in <Home>/Library/Preferences, and delete that file. It’ll probably be called something like:

com.company_that_made_it.program_name.plist

That will reset the program to it’s “factory defaults” the next time it’s run.

(I don’t understand “stretched below screen”, either, but I assume you mean the window is partially off the monitor).

Also, make sure your monitor cable is tight; if they get loose, sometimes computers think the monitors are larger than they really are.

I did mean that the window is partially off the monitor.
I opened it with Quicktime. I just tried it in iTunes and the image was stretched, but it was contained within the iTunes window. It wasn’t partially off of the monitor.
I have an iMac so there’s no danger of a monitor cable being loose.
I wonder if it has anything to do with the new Quicktime player. The file is a few years old and I played it with the old player. Maybe the image was always stretched but the old player didn’t resize.
Are there any keyboard shortcuts that will allow me to resize the player without the mouse?

Also, I’m running Snow Leopard, if that makes a difference.

Try command+1 or also 0, 2, 3, and f. These have different meanings in different video programs but they generally refer to different projection sizes that may resize either to the size you want or to a size you can adjust.

Command+3 fit the player to my screen, but when I clicked the lower right corner to resize it Quicktime popped back to the too big size.

I just tried it with the Divx player and it played correctly! Why would it be correct in one player and not the other?

But…but…It just works!

You can also try Command-F will “Present Movie” and stretch it to your screen size with fade-away controls when you need to use them.

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