If you use relative paths for Flash in WordPress, for example you have a basic .swf in which you load new shock wave files or images into, you may find that flash is unable to find these external files. The result? A big white space where you expected a fancy, flashy, all singing all dancing design.
An easy way to tell if your suffering from this issue is if your movie works locally but doesn’t when embedded on your site.
To fix this problem you simply need to tell the embedded swf where it is residing using the “base” attribute.
Hopefully this will solve any issues you may have.