I've had problems with the back button also, but it may not be the same problem reported here.
One of my machines at home is a sun unix box, running netscape. Sometimes when I use the back button in the flyertalk forum there is no 'wait' indication (usually the cursor turns into a stopwatch) or indication that anything is happening, yet the browser is doing something, but I can't reload the forums part of the main bulletin board page when it gets into this state. At this point, my only option is to kill off the browser, and I have to go to extraordinary measures to do it. (Closing or exiting isn't enough, the process doesn't exit, I have to do a 'kill -9' to get rid of the running process and restart it.)
I'm not sure what's different about flyertalk than other web sites, but this seems to be the only place I have that problem.
-David