I have a somewhat different problem.

When I sync from my 3G connection, everything works fine.
When I try to sync from home, connected through Wi-fi, it just gets stuck on "synchronizing". The application is responsive, but it just never gets to step 2.
I thought that maybe two dropbox accounts from the same IP would trip up dropbox, so I closed my account on the home PC, but to no avail.
Anyone understands what is happening?

[edit] It wasn't working at all, I did the changes proposed in this thread, then, got the behaviour I describe here.