Would changing the choice from PHP 4.x.x to 5.x.x mess up anything within my current site? ie. current php products such as forums etc…?
Depends on the software you’re using. One of the biggest changes from PHP4 to PHP5 is the disable of register_globals and magic_quotes. If you have any scripts that requires any of those, then it’ll break. If you have good scripts (ie: updated) then you should be fine.
yerba# rm -rf /etc
I went ahead and selected the 5.x.x and it works great!