I think I saw a comment about this in one of the discussions, but every once in a while, when I click on a label link in the label box, instead of simply loading the appropriate messages, the page refreshes and Gmail completely reloads (this happens when clicking individual labels, not just the top-level searches). It only happens occasionally, and I haven't figured out any pattern or been able to reproduce it consistently. Any ideas?

Neither do me, but I've noticed that this usually happens soon after the login, and because I set my Firefox to always restore last session, gmail starts logged and this problem just don't happen with me anymore (it's like once in the year).
Anyway, I still have no clues on how to solve this.

CloudKicker, you've reported on version log that the refresh problem was resolved but I still experience it.
Is there something else that I need to do?

In case it's helpful, I've seen this happen sometimes when clicking on the Inbox link as well. I doubt it's related to LL4G