trouble with luna complete

[Stayce]

I have an unmodded playstation, and so I use the PS-X-Change version 2 disc to run my NTSC games on my pal machine.

Recently I purchased a copy of Luna Silver Star Story complete, but unlike all my other games (Xenogears, Chrono Cross, Parastite Eve, etc) it won't load. I get as far as inserting the game disc and pushing start when prompted and then nothing happens. The disc keeps spinning but the screen doesn't change from the 'push start' prompt.

I've checked for mod codes but the game doesn't appear to be protected. Anyone got any ideas as to what is going on, or a possible solution to my problem?