Polish text not displaying

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I need to add a Polish page to a website for a client and the problem I'm having is that some of the special characters are displaying as question marks.
I've researched the problem in the forums before posting & came upon a few possible solutions that did not work.
I followed the instructions on this thread:
http://www.concrete5.org/community/forums/internationalization/non-...
This did not work.
I also stumbled across a thread that said it's a bug with the last release of C5.
I just upgraded the site to the latest version of C5, and this did not work either.
Strangely, when I tried to hardcode in the HTML codes for the special characters, that didn't work, but it did for the page Title.
Anyone any ideas?