I have wasted an entire day trying to fix problems with my pages. After I realized that the pages stopped working when I moved from 1.3.2 to 1.4.2, I changed that line in my template, and my pages continued to work as before.
I have the greatest respect for the jQuery team and the library that they have created. I cannot for one moment therefore think that it is possible that the team would release a library that was not backward compatable AND not document it somewhere. Does anyone know where I can find that list - so that I dont get any nasty surprises in the event that I decide to upgrade sometime in the future?.
And for now, 'll just put the wasted day down to (an awful) experience.