This is what I did:
1. The system is PCLOS 2011-09 KDE (full version).
2. Fully update my system (synaptic > reload > Mark all upgrade > Apply > OK).
3. I am using my own account (other than Root and Guest, but I set the primary group of the account to "Root"). Whenever prompted for root password, I would enter the default password root.
4. On the desktop, I click on the Localisation Manager icon. It says... checking internet connection...then displays a list of languages. I choose Chinese (Traditional) > OK (or Apply). It says ... reloading packages ... testing if your system is updated etc (I am using Win7 now, so cannot remember the exact wording).
5. After it is done, logout and login.
6. Everything is exactly the same as before, no Chinese. I already have gcin installed, but pressing CTRL+SPACE has no effect. I can search in the PC Menu for "gcin" (I am using the application launcher menu instead of the classic menu), there are 2 results: gcin setup and run gcin. I click on run gcin, the gcin icon appears in the notification tray. I right-click on the icon and choose Changjie, but wherever I type the output is English. I have already installed quite a number of packages of Chinese fonts.
7. Go to Control Centre > Manage system localisation. The list does not have Chinese, only Burmese, English (Canada), English (US), English (NZ) etc. I click on Eng (NZ) and next. In the long list, there isn't China or Taiwan, the only one I can find is HK SAR, but choosing HK has no effect at all.
8. Go to Configure your desktop > locale. In language/region, under the language tab, there is only English(US) listed, no "add language" botton.