I finally got around to installing the final release version of Ubuntu Intrepid on my main desktop with only minimal issues that were not show-stoppers. One in particular was that Evolution was now marking every single word I wrote as being a spelling error when there were no errors at all.

Luckily, this one is easily fixed.

1. Go to Edit->Preferences, and the Preferences window appears.
2. Now click on the Composer Preferences icon on the left and then click on the Spell Checking tab at the top. You will now see the available languages to do spell checking with. At least one of them will already be checked.
3. The issue is that despite the option being checked, it’s not actually checked internally within Evolution. All you have to do is un-check your language and re-check it, then click Close which will re-write the preferences.

You might need to restart Evolution again (I needed to after re-installing SpamAssassin), but you will now find that Evolution is now correctly doing its spell checking again.