Bukkit

What steps will reproduce the problem?
1. Importing downloaded map using Multiverse (/mv import MAPNAME normal)
2. Marking the map using World Edit
3. Creating the map

What is the expected output? What do you see instead?
Map saving successfuly, map regenerating, drops getting removed after reset/Map doesn't save successfuly, map does not regenerate, drops stay on ground.

What version of the product are you using?
Latest

Do you have an error log of what happened?
No

What other plugin(s) do you have on the server?
TuxTwoLib, NoCheatPlus, WorldEdit, RewardVoting, XPMultiplier, MassiveCore, SafeFrames, Vault, NoIPAdvertising, PermissionsEx, Multiverse-Core, WorldGuard, CeaseTime, Announcer, CoreProtect, Lockette, Votifier, HolographicDisplays, MoreHearts, CleanroomGenerator, Essentials, Residence, ServerSigns, EssentialsSpawn, CreativeGates, Multiverse-Inventories, IslandWorld, Paintball, AuthMe, EssentialsChat

Please provide any additional information below.
The maps are fairly new, about 2 months old.
Server is using Spigot 1.7.10 RO 1

Drops being reset are fixed in the latest development build.

Make sure you have a good amount of ram. I recommend at least 1.5gb. Sometimes if your TPS is low, you have too high of a CPU usage, or have very little ram left, the save can be stuck and hang at 0.0%. Make sure this is not happening. If it continues, whitelist the server and try again. More players = higher CPU usage, less ram available for the plugin to save the map, lower TPS. Since you have Essentials, you can check pretty much all of this using /lag.

How big is the map? If it's higher than 500+ block radius, it will most likely not save correctly or at all if you have a low amount of ram.

Try downloading your server/making a copy on your local machine and running it. Does it provide the same issue? Or does it work? There are a lot of key factors.

If all of these fail, try running your local server and using the latest development build. In the latest build, all drops are reset as far as I know, so that could solve one of your issues.

Also, what is the meaning for the title? Is this something SurvivalGames throws out at you when trying to save or reset the map? Is this a Multiverse error?