A follow-up question - I've also started having issues applying user themes from nonfree. It throws the error 'Error: undef error - Layout layer for this user layer not found. at /dreamhack/home/8267-momiji/dw/cgi-bin/LJ/Customize.pm line 377. ' even though /customize is being populated properly with their names/preview pic. This is less of an immediate problem, given how few there are of those, but it probably needs a solution and documenting at some point.