I haven't had much need for container fields until recently so while I have a good deal of FM experience, not much is with container fields.
Environment: FMP13 clients connecting to FM13 Server. The container data is stored in the DB itself. The OS is 100% Windows.
If I place the fmp12 file on a regular desktop PC the container fields are interactive. By interactive, I mean PDFs for instance can be viewed directly and the user can page through the document without needing to export the PDF. However, if I place the file on the server and let Filemaker Server 13 host it, the container fields are not interactive. All I get is a page that says "Webpage Cannot Be Displayed." I can export the PDFs just fine but I cannot interact with them while they are in FM.