09-13-2011 05:18 PM
From your homescreen, go to Options>Typing and Input>Language. Make sure everything is set to English and English (U.K.).
Next, I have a question for you. Does the dot on that letter appear when the letter is within a word, as opposed to by itself as in "I am happy"? Your BlackBerry will automatically capitalize the letter if it stands on its own. If that's the case and you wish to not have it capitalized, go to Options>Typing and Input>Word Substitution, scroll down to the "i", press the menu key and select Edit and change the capital I to a lowercase i.
Let us know if that helps you.