The Cardiff Bug

File this bug in the “very specific” folder:

Some Adobe applications can’t start in Mac OS X v10.3 if the time zone isn’t set or it’s set to Cardiff. Setting the time zone to a setting other than Cardiff resolves this conflict. After you’ve changed the time zone and restarted the computer, you can reset the time zone to Cardiff (or any other time zone) without encountering this conflict.

Emphasis mine.