Foreign Security Principals in MMC

We have ARS 7.4.3 running in one forest/domain but we have a number of other domains that are trusted to this one.  They  are not part of ARS since we are collapsing them down into this domain.  We have some Domain Local groups with members from these other trusted domains.  When we look in the MMC at the members tab of one of these groups, most of the members (not all) do not resolve and the FSP stays.  Only a small handful show with a readable name to know which domain and account.  However if we use the ARS website they resolve.  I was wondering if anyone else had seen this and if perhaps we have a config issue?