I fixed a bug recently that was stopping attachments from attaching to posts and PMs. The attachment would have uploaded correctly, but if you didn't preview the post / PM you wouldn't know that it hadn't attached properly and instead be sat in your uploaded attachment queue.
(Although I was amused to discover I was very busy with work in 2007. If I remember right, that's the year I got sent to Switzerland in January. This year, I'm in the office, but working ridiculously long hours).