Problem generating and viewing HTML

I have a large organization chart that I have created using Visio 2007
with the data stored in a SQL database. Our organization has about
1,000 employees. I am having 2 problems. First, sometime Visio stops
responding when it is generating web pages for the project.

The other problem is if I am successful generating the web pages, when
I view it, it has the shell structure but none of the objects appear,
only the infamous red X where the image should be. I look at the
properties for the image for the file and it does exists. I have tried
viewing using both IE6 and IE7. I have also tried saving in different
formats but no luck. I do need to retain the advanced functions in
the browser such as the search and detail functions.

Of course to make matters worse, 'it used to work', so I know the
ActiveX needed for this worked at some time. I am not aware of any
changes made to my system that would have caused this to not work any
longer.

Any help and direction would be greatly appreciated.