Community
I am having the same issue with the display order toolbar. Typing display order at the command line works fine, but is there a solution to the toolbar issue?
The functions that the toolbar command(s) call are defined in "acad2012doc.lsp" (or replace 2012 with your version, like 2010, or 2011,. etc)
Paste this to the command line (fix the number as above)
(findfile "acad2012doc.lsp")
What do you get?