I've tried various combinations of things, with consistent results. Whenever an item called via PRPC includes a call to a geometry in an external runtime, Poser asks for the OBJ to be located. It doesn't seem to matter which runtime you're in according to the library palette. Thereafter, that same item can be re-loaded without an OBJ request. Poser "remembers" the geometry folder. If I then call something which has its geometry in a different folder in the same external runtime, Poser again asks where it is, and that's remembered, along with the original item. I haven't experimented to see if this geometry folder memory is infinite, or whether it has limits. Calling things which are in the main Poser runtime always seems to be fine. I've IMed TromNek to see if he has any ideas. I should have done that straight away, I suppose, but I was interested to see if anyone else had the same trouble.