Okay. I went and found two of them at random.
Horcrux 1.0.0 -and- NewsMojo 1.0
Both installed and activated without any problem. Previews were present, and they applied as expected. I didn't see much point in going any further. I did notice that they were more than one directory deep when extracted, but that isn't as much of an issue as it used to be. They should be in your themes directory like this:
/wp-themes/horcrux/themes_files - not -
/wp-themes/horcrux/horcrux/themes_files
Use your ftp client to check the directory/file ownerships and permissions on those themes that won't activate, and compare them to one that works normally, just to quickly rule out the possibility of some goofy permissions quirk. It's a longshot, but at least you can rule it out.