I have a similar issue since today (did not happen before). I use Camino 2.1.2 on Tiger, and at random, the page is replaced with a blank page at the end of loading. So I see the correct page for 1/10th of a second, and total whiteness.
If I reload 3-4 times, it might work.
The front page has more problems than the forum pages.
If I turn off JS, no issues.
When you get that blank page scroll up and down then back up and see if the page appears.