Does the problem happen with all Amazon sites or just a country-specific one? If it's country specific, please send us an email and also have a look at your console log, see if there are any messages from your Pedia program. You can access the console log via the application 'Console', located inside your Applications/Utilities. The newer messages are towards the end of the log.
If the problem happens with all the Amazon sites, check your time & date settings in the System Preferences (these have to match your current time zone in order for the Amazon search to return your query).
