I'm about two weeks into the whole WP thing, and I'm loving it. I discovered a problem last night that I can't seem to pinpoint or fix.
On one of my installs, when I try to go to the second page of the manage posts area, I get a 404 error. I decided to reupload my wp-admin. That didn't work, so I deleted and re-uploaded. I reuploaded all the WP files in the main directory and in wp-admin & wp-includes.
I finally thought perhaps it was my theme, so I deleted the custom theme I'd made and used the default. No go.
All my reuploads are coming from a new unzip of WP 2.2, it's a subdirectory install, I have two other WP installs, a Gregarius install, and a Gallery 2 install.