Guess I could have included a LITTLE more with that last - sorry! Make sure the "wizard" button on the toolbox is turned off first so you you don't get the annoying hoops MS wants you to jump through, then set the recordsouce manually. If you still get blanks, make sure that whatever you have for controls in the detail section are bound correctly and visible = true (yes), or even just add a label that says "TEST" to see if the subreport is even getting called. Lastly, make sure that whatever you are using for a datasource has something in it. Sounds stupid, but I have wanted to leap from tall buildings because queries that "worked fine" were returning null recordsets.
Anyway this all seems too basic to address your problem correctly. If you like (and are still hung) send stuff to me at gkent@crinet.com . I am leaving now until MOnday AM, but will respond in more detail if I get mail.
GO PACK! (It's a Wisconsin thing)
-Geno