I can't see the changes that were made to a flash banner on my site?

Chances are you need to clear your cache.

Web browsers hold a "copy" of your flash in the system. So in order to see changes, you will need to clear your cache.

If this does not solve the problem - check to be sure that the flash SWF file was uploaded to the correct space on your website and that there are no extraneous spaces in the file name.