Count me in
Having fundamentally the same issue as most everyone else.
If this is at all pertinent, I've made extensive changes to the existing css in your files plus to "mystyles.css".
and I don't get past the warning as displayed in the first post in this thread - image2.
The above was on my MacPro Laptop Leopard
I get the same on my G5 Tiger desktop.
Files are on a network drive serving from a Mini Leopard MAMP