CP5 files work, CP6 files do not on our VPN network...

Hi All... tough one here.  We have a few simple demos that will not play on our VPN network.  No complicated actions, simply click here to continue style.  They play great when connected to the wired network, but when users access through the VPN, it's hit or miss. When they can't access it the preloader just stops. Granted, I know what you are saying... bandwidth, security, etc.  Here is the thing.  Captivate 5 works fine, flawlessly, even larger files.  I've tried removing the AllowScriptAccess in the htm file, nothing.  Putting the CSS inline in the .htm, no luck.  When it is not working for VPN users, it's as if the file does not exist.  We get a page not found if we try to hit the swf directly.

Our IT is currently looking into it.  But the question is, what is different in the published SWF between 6 and 5?  There must be something going on in the AS that controls the published SWF that is causing this issue on our VPN network.  I would love to be able to tell our network guys what box they need to check to get Cap 6 files working on our VPN network!

Any ideas????  Thanks in advance. 

Chris.