I was running fluxbox on my Debian Sid previously,and everythings works well.
then I tried installing blackbox because most extra features provided by fluxbox eg. tabs didn't seem really necessary to me and I thought the original blackbox may be a better choice for me.
while after entering blackbox I found that scim won't start
what was worse was that it won't work in fluxbox either after blackbox's installation
so I had to uninstall blackbox,and scim came back to me again
well,I am not sure whether this is Sid's fault(this oftern happens...) or some conflict between blackbox and scim,so I just post it here in case