you guys didn't read what i said it seems
I updated my US client to 4.3 (4.3 is live on US server) I was playing it for a while.
like previously US client 4.2 with the fix applied, can log on to china WOW 4.1.
however this time, US client 4.3 with the enlaunch fix, can not log on to china wow 4.2, the client crashs and gives this error.
ERROR #0 (0X85100000) ASSERTION FAILURE!