I have found that PL/SQL Developer v10.02 has a bug in the syntax highlighting logic, when the source includes the quoted string (q'[..]') syntax.
Internal single-quotes no longer seem to be recognized correctly, and the "string" text color continues beyond the final quoted string delimter...
Marco, I don't think Claus ticked the "Do not show this message again" checkbox. I just tried this and I *definitely* didn't check the box and I do NOT see the message a second time, even after logging off and logging in to a new session.
- Colin