If you experienced the inability to input Chinese characters on your Mac, it may be due to a small "tick" in one of the options. This is a short article.
I am Chinese (mostly). I read and write Chinese, rather well. It is after all my language, and it is a beautiful language that immediately gives visual meaning to words.
I am more used to Traditional Chinese (繁體字), rather than the Simplified version (簡體字). So I have been effortlessly entering Chinese characters on my Mac (running OS X 10.7.x or otherwise known as "Lion") without any trouble.
Today, I had to input Chinese in the Simplified form, since the local media are educated in Simplified Chinese. I kept trying to input the Chinese characters after selecting the "Pinyin - Simplified" option under my "Language & Text" settings, but to no avail - only Roman characters appeared.
Then after much googling without success, I decided to try checking and unchecking some of the preferences under the Simplified Chinese option. Then I hit upon the reason why I couldn't input in Simplified Chinese - the "Two-byte Roman characters" option is checked under the "General" settings. By unchecking the "Two-byte Roman characters" option, I could input in Simplified Chinese again using "Pinyin" input method.
So, sometimes, a problem may seem colossal, but the solution could be a really simple one. Never neglect to sieve out all possibilities methodically and meticulously. Leave no stone unturned and you may just find the "Ah-ha" solution - and then (facepalm) with an exclamation, "why didn't I think of that?!"