InDesign CS3 Unexpectedly quits - Adobe Indesign

Installed InDesign CS3 (actually all of Creative Suite 3 Standard) on a brand new MacPro Intel G5 running Leopard about 5 weeks ago (2 GB ram). (Ran all updates that were available at the time.) All CS3 products were working fine until InDesign started crashing when starting up with the "unexpectedly quit" message. (Photoshop, Illustrator and Acrobat portions still fine.) In Design had only been started 5-6 times since the initial install was completed.

Have since run OS 10.5.4 update and InDesign 5.0.3 update (and permissions repair, of course). Still will not start. Have dumped InDesign preferences and all Adobefnt.lst files. Have tried starting in safe mode and root user. Still crashes. (Three other older computers with same software - 2 Intel G5s and 1 G4 - are all fine, so it's not like I don't know what I'm doing at all!)

I'm thinking I may have to dump InDesign and reinstall it with all of its updates. I'd really rather figure out what caused the problem and fix that, so I don't have to deal with this yet again.

Upon InDesign startup, it seems to get past the "startup services" portion and crashes on something that has "..SING.." in it. This goes so fast, though (on every computer), that I cannot pick up on the complete phrase.

Anyone know what this "SING" thing is, and what could make it corrupt?

Thanks.
Ginny