All rules are logged exactly the same way in the same places (ALERTS tab and also the system log if you have that option enabled). If you don't have alerts from your Snort VRT Community rules, then either none of the those rules have yet been triggered, or you don't have them actually enabled. The Community set ships with the vast majority of the rules disabled. You must enable the ones you want to use. You do this on the RULES tab by selecting the Community rules in the CATEGORY drop-down and then enabling the rules you want to use.
The IPS Policy rules do not false positive very often, so it is normal for them to be quiet.
Bill