firefox couldnot be launched after installing scim(dapper)解决

[glade]

(newly installed dapper)
i install scim using the following command
sudo apt-get install scim scim-modules-socket scim-modules-table scim-pinyin scim-tables-zh scim-input-pad

and then i install im-switch

after relogin i found firefox could not be launched, it seems this problem is related to scim
i try to remove im-switch, but no help
finally i remove scim, firefox is ok
any suggestion?