I don't know if I solved this with what I did or what, but anyone with this problem could try the following:

*renaming a couple of things, won't take long with find and replace...
What I did was change every instance of "simpleViewer" in code with "simpleViewerMYVERSION"
(e.g. import com.airtightinteractive.apps.viewers.simpleViewerMYVERSION.Image;)

*publish the swf with different name as well

So I just tried to separate the two instances of galleries from each other completely...

(my previous entry below...)
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I'm having a similar problem to that of liquidcreations. Anyone have any ideas what to try so far?

I'm loading two simpleviewer pros inside another swf file, actually loading one straight inside the parent swf, then another inside some other 'child' swf later on...

That is not the problem, but the fact that first one has correct layout, the next always wrong, which ever order I end up loading them... So exactly like liquidcreations post...

The reason I have two different simpleviewers is that I needed different kind of navigation buttons in addition to different layout in the other gallery. I even renamed the viewer swf files, but they still interfere with each other. I could not think of a way to do this with just one viewer, but thought it would work perfectly with two separate ones...

Should I keep renaming things inside the .fla and .as files until they don't interfere anymore or what??

Great viewer though!