I already did, since I had 1.2.5 on before - the 1.2.6 version I uploaded was fresh.

Hmm, it appears to have fixed itself. Very weird hmm

On my punBB install, my posts are appearing twice - by "my" I mean just my user's, the only admin. They are, however, appearing twice for everyone, not just me. They are only in the database once, and everyone else's are fine; even posts I've made before this started happening are appearing twice, so I guess it must be a bug in the display of the posts and not with the database itself.

This has only starting happening today, I've not installed any mods or anything that could have caused it; I upgraded to 1.2.6 to see if this fixed it, but it's still happening.

Any ideas?