This is actually a really strange problem I discovered in the latest nightly (01-12-2005). When I edit a theme using the theme editor, the changes don't go live - even though when I downloaded the file, I could see the changes just fine so the edit definitely took place.
The only way I've been able to make the changes appear is to deactivate and then subsequently reactivate the theme. I tried clearing my cache and all that to rule out that being the issue...I can't figure out why it's doing that. Certainly is rather pointless to have to do that everytime I want to make one small change.