I am playing on my friends server and he is running it via 'Host & Play'. The first few days everything was running and working fine, however yesterday & today we have been experiencing roll back issues making us lose our progress. For example, we killed planterra yesterday and got off on that note. However, logging on this morning we still have planterras loot, however the unlocks you get from planterra we did not get (e.g ectoplasm from dungeon, tiki set from witch doctor). It's also important to mention that our character progress themselves (i.e items in inventory) do not roll back, only changes made to the world (includes placement of chests and items in chests).
We are currently running the following mods:
Terraria Overhaul (v5.0 BETA 12C) v5.0.0.21
Recipe Browser v0.9.8
Ore Excavator v0.8.4
Calamity Mod Infernum Mode v1.8.17 (Disabled however)
Fargo's Mutant Mod v2.8.8
Calamity Mod Music v2.0.2.2
Catalyst Mod v1.1.0.6
Calamity's Vanities v10.2
Calamity Mod v2.0.2.3