Hi there,
searched the forum for a similar issue, nothing found. I opened an AI file in AD and the Czech CE character (š, ě, ť, č, ř and so on) do not display - the see attached screen shot. In any other program running on my Mac never had and have any problems like that. To be sure, I tried to type these characters in a completely new document - with the same result.
I appreciate any ideas, how to solve this or identify its cause.