You have three different copies of SWFObject being loaded. My plugin is the only one doing it correctly (using the API designed to avoid exactly this sort of thing). The other versions of SWFObject are old and probably buggy too.
I'd recommend you disable all other plugins temporarily to confirm my suspicions. I think you'll find it works perfectly afterwards.
The poorly coded plugins by the way are "wp-flash-img-show" and "wp-cumulus". WordPress comes with it's own copy of SWFObject and yet these plugins are outputting their own old copies of SWFObject anyway.
And you should be able to find a copy of v6.2.18 here soon I think (I just tagged it):
Although I doubt that'll fix the issue as all that and previous versions did was unregister the older version of SWFObject that WordPress used to have and replaced it with a newer version. That code shouldn't have done anything in a while though as WordPress updated it's version. Plus the other plugins aren't using WordPress' scripts API anyway.