Sims 2 - Bon Voyage suddenly says my original is a "backup"

[databanks]

I've tried the fix suggested at MTS2 - change the shortcut target to the EP instead of the launcher. No luck. It's rather insulting, having a game tell you it's a burnt copy when you can see it's the 3 week old original CD sitting in the drive tray. Any one think maybe that's a good reason to try a noCD patch or would whatever is causing the error still be there? Most of my older games I just grab a patch & put the original away anyway - saves accidental scratches etc (all it takes is dropping it by mistake).
I'm a bit irritated with the game as it was working just fine only 24 hours ago.