Aaron,
The virtual server where it does display has no iRules, which is why I am looking at the iRules as the possible problem. I can't post the iRules because they are on an intranet, so I can't cut and paste them and they are too long to retype. I can tell that they basically pull a username out of a PKI certificate and put in in a header for the application layer.
Again, the headers I see when using LiveHTTP header look identical, including the character encoding (UTF-8), so I am not sure if the iRules are doing anything, but it seems to be the only difference in the two environments.
Does it make sense that this problem could come from the iRules? I found very little about character encoding on DevCentral, but I am running out of places to look.
Thanks,
Don