Shift-Reload? Never heard of that. What does that do? I tried it but couldn't see it do anything.
Empty the Browser's Cache? Is this the same as deleting temporary internet files? I tried that, yes.
Load the style sheet directly into my browser? Do you mean doing something like this in the address bar? http://127.0.0.1:81/perl/secure/training_site.css
I tried that; it only opens the style sheet inside of an editor.
View the source page received? Yes, and the HTML code looks fine. In fact copying and pasting the resulting HTM code as it's own HTM file does correctly display the styles.