Ah: yeah, in that case, PhotoStructure will limp along with what it still has access to. You may want to enable automatic organization, to sweep everything into one tidy directory structure.
It depends on the export software: if it uses one of the four standard locations for face data that PhotoStructure looks at, PhotoStructure will pick it up.
As of v2, that list is
"People",
"PersonInImage",
"PersonInImageWDetails.PersonName",
"PersonInImageName",
"RegionInfoMP.Regions.PersonDisplayName"
If your export software uses a different tag, please tell me: I’m happy to expand that list to accommodate
Check this out:
Open the info panel (the “i”), and click the ellipses by each path name to open the enclosing directory with that file highlighted. The next release also lets you copy the native pathname to your clipboard.
Oof, yeah, that’s a known issue. See this forum post for the discussion. TL;DR: I will fix this as soon as the next release is out: it bothers me too!