Before on my Bold 9700, I went to browser and to type something on the url link, I pressed double space bar to make a period sign. Doesn't work for Bold 9900?
Try a battery pull maybe? And it's usually a double space for a period in a text box (like when making a reply here on cb). It should be a single space in the address bar or when entering a period or an @ symbol in an email address in a field.
For me the double press spacebar period works when I:
-text
-write something in memopad
I notice on the url link browser if you press "www" then press spacebar once, it will give you the period. Well thats weird, i guess it works for some people but not all. oh well...