Ok, Snort is running now. I had to export the config xml and edit out the rule categories which were generating exceptions on system log as stated before. Once I restored it, Snort is now running although I still feel that Snort should not die if choosing what it considers as a invalid category.
Anyway, now I have a different issue which I am not sure if it is Snort install related since I also updated to the latest snapshot. Now, I can install Squid or Squidguard or Cron individually, but if I install more than one, the other gets bumped off of the services list. Even the menu entry for the previous package is lost. In other words, only one service can be active at a time from among installable packages. This is just a rough observation since I haven't tried all different combinations of packages.