paste from text and word blank box

Hello i have ten sites but for some reason the paste from text and word shows blank box. But only on this site. ive looked all over the forum and there seems to be other users that are having the same problem but know one seems to knows the answer.

what i have done so far

disabled all plugins
reinstall wordpress 3.2.1
tryed also diffrent browsers

all other sites work fine just this one does not any ideas