HPSF does no longer recognize property sets. You can verify this easily using the POI browser: Opening a "Summary" or "DocumentSummary" should display the properties in the set with names and values on a light green background. However, it does not recognize them as property sets and therefore just displays them as any other POI file: a byte dump on a white background. This worked fine before Andy changed HPSF to use the common little endian classes, so I guess he broke something. I haven't looked at his changes yet since time is still an expensive resource. But anyway, I don't like to wipe the floor after anyone else. He who broke it should fix it.
I give up.
Okay, I'll roll back the changes to activate the latest working HPSF version.