When I step forward through the Area51 proposal pages, it gets stuck, and takes about a minute of waiting get into gear. For instance, if I successfully make it to page 6 (as indicated by the inverted page number on the bottom-right), then click next or 7, the link will be
http://area51.stackexchange.com/?page=7&tab=hot, but I'll still be on page 6, with all the same proposals shown.
This is probably a caching issue, meaning I should probably try throwing away my cookies or clearing my browsing doohicky. I'd rather see if someone can reproduce the issue first :-)
I'm using Firefox 3.6.10 on Ubuntu 10.4 (Lucid).
Edit: The problem does not seem to occur when logged in.