I get the above message with every Pages document I try to open.

If I send the document to a different Mac, I can open the document fine with Pages in iwork.

So I assume the application has become corrupt or there is some interaction problem somewhere.

I was just going to reinstall iwork - anything I should try before I reinstall?

And what is the best way to re-install, just do the installation and expect the Mac to replace the existing files with the new ones or should I first delete whatever Iwork files I can find and then install?

perhaps just trash the iworks.plist from your preferences first before trying a reinstall.

Thanks,

Tried that.
Doesn't change anything.

For future reference;

1. Installed iWork '08 (which was the original install) again over the existing "corrupt" version on the Mac.
That did not resolve the problem either, Pages quit as soon as it was opened.

2. I then deleted iWork '08 in the application folder.
Did a search for other files containing the word 'iWork' to delete those as well but nothing came up

3. Reinstalled iWork from the original retail disk. Pages came up fine (did not quit immediately), but it now asked me for the Serial number.
Luckily I still had that, entered it, was accepted - everything looked good at that point.

Opened the first Pages document on the Mac and the next problem came up - all pages in the Pages document already on the Mac were blank.
Well turns out they weren't actually blank, the text was white.
Tried all the colour settings on pages I could find, made no difference. Even when selecting 'black' the text was still white.
Did some googling and came up with the answer. The iWork software installed was version 3.0, but with Snow leopard one apparently requires version 3.0.3. White text with version 3.0 is a known problem.

4. And final step, ran software updates. Pages 3.0.3 was one of the updates offered. Downloaded and installed that and all other updates.
Everything now works as it should - nice black text is back.

Thanks for the update and feedback, but I'm surprised that your Software Update worked as well as it did.

I ended up with a corrupt Safari some months ago and Trashed all signs of it, shut down, rebooted and downloaded Safari from Apple's site and installed it. Restarted and ran Software Update, but it said my Safari was up to date - NOT!!

I finally discovered there was an 'invisible' file that Software Update apparently uses to check as to what has been updated. Trashed it. restarted and Software Update worked to get and install the latest and appropriate Safari version.