When working in a text box, if I type the following:
Blahbitty blah (huh?) yxxx
the “Y” is automatically capitalized, because it thinks I’m starting a new sentence because of the question mark (or exclamation point) in the parentheses. Worse, if I hit control-Z to uncapitalize it (which tends to work in Word and in email), it sends me back to the beginning of the word – and if I then move the cursor to the end of the word, it capitalizes it again.
So: Auto-capitalization when it shouldn’t happen, and difficulty in canceling the auto-capitalization.