Firefox is not displaying alt codes correctly, substituting a black diamond with a white question mark in their place.

Alt codes (such as ® for "registered" and  for "trademark") are being displayed as a small black diamond with a white question mark inside of it. This has also started happening to more simple characters such as exclamation marks, dashes and apostrophes.
Any ideas?

Thanks for your reply cor-el.
My posting actually included the alt code syntax, and is now rendered as the corresponding special character. I guess this isn't a surprise!
And no, it was rendered just fine. This morning when I went into the browser to see the problem, it was not mis-displaying as it had been...it had somehow changed and was behaving very nicely. That's all fine, but I'm a little bit wary of this FF browser functionality now...steady as she goes.
Also, I did check the (View > Character Encoding) you recommended, and after experimenting a bit discovered that using "Unicode (UTF-8)" made the wierd black diamond/white question mark character come back in all of the same places it was occuring...up until this morning. I've set my browser default to "Western (ISO-8859-1)" now, and everything is displaying as it should.
Thanks for your reply and suggestions. I hope others will learn from these experiences.

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Firefox is not displaying alt codes correctly, substituting a black diamond with a white question mark in their place.

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