I'm starting to have a problem not being able to place pdf in Indesign CS4. My guess is that I updated my Acrobat software to the point that Indesign CS4 no longer recognizes the file format. My work around so far has been to use the preflight function in Acrobat to change the version of the pdf. Is there a fix out there such that Indesign CS4 will be able to place a current PDF?
There is no PDF format that should cause ID CS4 to have a problem. Of course, you've given us zero details about what the problem is so there's no way to know how to fix it.