Images suddenly blurry/pixelated on some monitors

[cat_cat]

I have a Flash movie full of jpeg images. On my monitor the images look very good, but on some other monitors the images appear pixelated or blurry. In one case that I know of, the images used to be clear, but suddenly they've become pixelated. How could this be? Nothing about the Flash has been changed. Any thoughts are welcome.

[TomMalufe]

JPEG is a really cool compression technique developed in the 1992 and accepted as a standard in '94. It's great and I love it, but it's got it's downsides.
To keep it short, try using PNG files as suggested in the Adobe help files

Adobe Help -> Using Flash / Best practices / Optimizing FLA files for SWF output / Optimizing graphics and animation:
Note: The best bitmap format to import into Flash is PNG, which is the native file format of Macromedia Fireworks from Adobe. PNG files have RGB and alpha information for each pixel. If you import a Fireworks PNG file into Flash, you retain some ability to edit the graphic objects in the FLA file.