OK...so my admin was working for group policies to restrict access for some VPN users in ASDM. In one of the group policy profiles he hit the "manage" button under General Client Parameters and "Split Tunnel Network List". He unchecked a particular VLAN in that list.
Once that was pushed to the ASA 5520 we lost the ability to ping anything on that VLAN. The router can still see the VLAN - no issue. The servers on that vlan can ping out to the main one. We just can't ping back.
FOund some log entries. We're getting this:
No translation group found for icmp src
VLANC is 172.30.200.0 and VLAN A is 172.30.100.0
VlanC can access VlanA. VlanA CANNOT access VLANC