If you are finding annoying special characters showing up on your iWeb pages read on. This problem will specifically effect people who are not using .Mac and are uploading pages via FTP.
Your FTP client may actually be corrupting the character encoding. To turn this off in Fetch go into Preferences -> Misc and uncheck ‘Translate ISO Characters’. You may need to search the documentation for your particular client.
Before I figured this out Therese and I were baffled as it was showing up fine locally. We tried changing fonts, turning off smart quotes etc. But it was still showing the funny question mark for any captions which we left blank.
Hat tip to Tom Gewecke for posting a solution on the Apple support discussions.