Here's few more issues I noticed recently:

1. Links in posts don't appear different unless you mouse over them - making it very hard to spot them.
2. The attachment manager is very hard to use - the light text on a white background is particularly vicious. Equally the light attachment names on the drop down list from the paper clip in the post interface itself is very difficult to read. Currently the whole mechanic of posting an image is tricky.
3. Tags don't auto-complete like they used to.

I'll post more as I find them, but the attachment manager is the most pressing - we need to be able to upload images!