Just installed 2013. I find that some dialogs do not display. This is not a FILEDIA or CMDDIA problem. I know for sure that GROUP and ARRAY will not throw up a dialog. Only get command line options. Doesn't matter if command is via toolbar or typed at the command line. I don't use the ribbon but there's no way the typed command shouldn't give the same dialog as a ribbon button would. A coworker has similar, though a more serious case. For him the HATCH dialog doesn't appear. A typed or toolbar call to HATCH or BHATCH just returns a command line with "Select object [Pick point/seTtings]:" or something close, i.e., very short prompt. He can type "T" and get the dialog. But, if the toobar button macro is revised to: ^C^C_bhatch;T; no dialog and the "T" invokes transparency option, which isn't even available in the expected prompt. To recap, on both of our workstations only some dialogs fail to display, most behave as expected. I've checked the menu macros for toolbars to be sure no command-lines are being called.
(Sidebar to Melanie - My only thread prefix choices are 2012 and earlier. (no prefix) was the default.)