ive found on 2 flashpoints if one or more of the group memebers die and run back in befor the encounter has wiped or completed no loot is givin. example. doing a flashpoint we started to wipe. i ran back in and we still ended up wiping. we tried again and completed the encounter with out zerging and thre was no loot giving upon killing the boss. ive seen this happen 3 or 4 diff times now. kinda sucks when you spend time on an encounter and get no loots or creds for your trouble.