Hi! Thank you for your quick response.
I was going to post that I'd figured out what was the problem.
The problem only occurs with Chrome clients. It has a special option ("Use DNS pre-fetching to improve page load performance") that was interfering.
So, to solve this when using Chrome web browser:
1. Go to "Options" menu
2. Select "Under the hood" sub-menu
3. De-select the options "Use DNS pre-fetching to improve page load performance"
4. Clear the cache
Once again, thank you for your quick response!