ok - i think i see your problem (its me again norbit had to register again on another account as i am not at work and cant find my password...).
Anyway this looks like a pathing issue with your flash movie - try -
[swf]/photos/slideshow.swf,470,391,8,#000000[/swf]
If this fails then check your flash movie - as it is loading, however it looks like your flash movie may be trying to load in aditional assets such as photos or data - as this movie is located in /photos/ and your blog is in /blog/ if your flash movie is using relative paths to load in data then it may fail to load its resources - check in your FLA that the paths are rooted - i.e. "/photos/[resourcename]" this will ensure that no matter where the movie is loaded from.
The reason why i feel its a bug in the flash movie is that when we tested including your movie from our site we got a white box - right clicking on it did not show "movie not loaded" so its loading alright...
To prove the function of the plugin you might want to try -
[swf]http://www.web-engineer.co.uk/images/addvrt.swf,170,170,5,#000000[/swf]
ok - lookin further at your pages i've spotted a possable issue with a script include - i'll have an update up tomorrow - as the work page is in a subfolder the path will be wrong with the script include.
The tags method your using would also work if you fix the paths within your flash file.