I just used the automatic WordPress update plugin to upgrade to WordPress 2.5 – and found that I’d not only lost all my tags, but my theme Big Blue 0.1 was no longer working. I upgraded to Big Blue 1.0 and was shocked to see that the creator or someone else had embedded an advertising banner in the theme.
I’ve commented the banner out. Serves ’em right. There was no warning that the theme was spammed on the page I downloaded it. If there had been, I wouldn’t have bothered.