Trying to make seps (postscript file) in illustrator (mac)

Hi all, can someone please help! I am doing colour seps from illustrator, postscript file. Never had an issue, but now when going through the process, it will only save one page (one colur ) and nt produce the rest of the seps (pages with sep colours). What is happening!!!!! Im doing the same process as Ive alwys done, so I cant seem to find whats happening. Please help!!!!