I have tried the font in both listing positions (recent and main list), tried substation, trying all the ways a font can be changed, even changed all the type occurrences to another font block by block as substitute would not work, saved as, then reopened and Slimbach continued to show bracketed.
Plain and simple, the problem is when a PM document containing Slimbach was converted to ID using the Adobe supplied plug in, the file was somehow permanently corrupted as far as Slimbach is concerned. If a converted from PM does never contained Slimbach, there isn't a problem nor any problem adding Slimbach or substituting a new font in new or existing files.