The computer I am running on at work is admin locked- IT can get in to change settings, I cannot. I have checked with them, and they tell em (through remote access) that I am up to date on SPs (would not say which SP, I assume ut is latest, as all our machines are set to update), and ran a repair on Project for me.
that was yesterday (15th)

Today, all was fine till about 11:00am, when project decided it would revert to its previous behaviour. It wasnt a huge problem- I tend to save fairly frequently, so I have 8 or 10 saves every day- but the problem is still there.

I cannot replicate this elsewhere, as I only have MSP07 on my other computers.

Doubt it is relevent but I have Autosave off, as I hate using it as saves usually take 15-30 seconds on a good day.
Still no idea