Messages.app asks for iChat every time I open it Every time I open up Messages, it asks me to locate iChat. This is on a new machine that I migrated from an old one on Lion and then upgraded to Mt. Lion. I don't have iChat on this machine any more, as far as I can tell. How do I stop it from prompting me? (It seems to happen only after a restart.)
(I haven't upgraded to Mountain Lion myself, but my understanding is that Messages has subsumed iChat.) That looks like the AppleScript find-the-application-named-in-the-script dialog. Do you perhaps have something that somehow runs a script when you launch Messages? If so, find that script and edit it to refer to application "Messages" instead of application "iChat" if that works, or remove it entirely.