Poser can cope with spaces in the folder names throughout the path to an object file, even an obj file name could contain spaces, since that is all passed to the operating system to handle, and MacOS has always supported spaces in filenames. OBJ files are more restrictive of names used within themselves. Group names, which poser matches to body part names for instance, are delimited by spaces in the OBJ file, so cannot contain spaces within a given group name.

Poser actor names can even contain spaces in their internal names, but things break down when the Setup Room has to make associations between actor internal names and bone/group names, because the obj/geometry parsing prohibits them, so, as @Biscuits advised, it's always safest to avoid spaces in internal actor names and mandatory for groups.

The other thing I notice is that you have assigned a figure number ":2" to the prop. Unless the prop is parented to a figure, it doesn't really need a figure number. But, since you mention you're loading it from a cr2 file, the implication is that it's part of a figure.

The mystery of why renaming the file would make it load correctly is very strange.

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