FileMaker Site Assistant Layout lists not showing

[DBHawk]

I'm trying to setup some simple XSLT stylesheets using the FileMaker Server Advanced Site Assistant and have run aground on the first step. I'm able to connect to the database I want but when I'm asked to Select site features, there aren't any layouts showing up in the drop-down lists. I've checked permissions on the layouts, etc. and everything seems to be in order (at least as I understand it). I can go ahead and create the style sheets without selecting layouts, but get errors when I try and run them.

Has anyone else run into this problem? The sheets are pretty simple, one with a single field for a search, the other to show 5 fields allowing the user to edit the content.

Any input is greatly appreciated.