How do I get my auto-finish turned back on when texting from my phone?

I have an LG Optimus, and recently it updated to Android 2.3. Since the update, I have no word “suggestions” when I try to text. I have scoured my phone for settings to fix it, but I can’t find anything. If I switch from the Android keyboard input to Swype it offers me word suggestions, but I much prefer to use the keyboard over Swype. Do I have to manually rebuild a user dictionary? Is this a known glitch, or are the settings carefully hidden away now? I can’t figure it out.