Ran a few tests using Lift v46.
When AntiCheat v2.0.1 was deactivated - Lift works like normal.
When AntiCheat v2.0.1 is active, Lift mechanism does not work and I receive the following in console:
04.02 22:38:36 [Server] INFO at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:147) [custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at net.minecraft.server.v1_7_R1.PacketPlayInBlockPlace.handle(SourceFile:9) [custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at net.minecraft.server.v1_7_R1.PacketPlayInBlockPlace.a(SourceFile:60) [custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:629) [custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at net.minecraft.server.v1_7_R1.PlayerInteractManager.interact(PlayerInteractManager.java:384) [custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at net.minecraft.server.v1_7_R1.BlockButtonAbstract.interact(BlockButtonAbstract.java:153) [custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:467) [custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:482) [custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30) ~[custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427) ~[custom.jar:git-Spigot-1223]
04.02 22:38:36 [Server] INFO org.bukkit.event.EventException
04.02 22:38:36 [Server] INFO [22:38:36 ERROR]: Could not pass event BlockRedstoneEvent to Lift v46

Thank you.

I am unable to reproduce this error in spigot or craftbukkit. Can you post your lift and anticheat configs?

Hi croxis - please find below the requested configs ("." added before # here to stop formatting)

Lift Config (v46)
.# Note: Smaller values result in less lag. Lift speed less than 0.4 may not work well for non spout servers.
.# autoPlace will automatically move players to be fully in the elevator
.# checkGlass will make sure all floors have glass blocks (at the cost of possible lag when starting a lift)
.# preventEntry will prevent players from entering an active elevator (at the cost of possible lag when lifts are running)
maxLiftArea: 16
maxHeight: 256
debug: true
autoPlace: false
preventEntry: false
preventLeave: false
checkFloor: false
liftMobs: false
floorBlocks:

• GLASS
• STAINED_GLASS
  redstone: false
  baseBlockSpeeds:
  GOLD_BLOCK: 1.0
  DIAMOND_BLOCK: 2.0
  STRING_oneFloor: There is only one floor silly.
  STRING_currentFloor: 'Floor:'
  STRING_dest: 'Destination:'
  STRING_cantEnter: Can't enter elevator in use
  STRING_cantLeave: Can't leave elevator in use

AntiCheat Config (v2.0.1)

.# AntiCheat configuration file
.# Please report any bugs: https://github.com/gravitylow/AntiCheat/issues
xray:
.# Should AntiCheat use calculations to try and find xrayers?
check-xray: true
.# Should a warning be sent to admins when a person is found that could be xraying?
alert: false
.# How often (in seconds) should AntiCheat check for xrayers if alert is true?
alert-interval: 60
.# Should players in creative mode be tracked for possible xray usage?
check-creative: true
spam:
chat:
.# Should AntiCheat block players spamming messages in chat?
block-speed: true
block-repetition: true
.# Valid actions = NONE,KICK,BAN,COMMAND[command]
action-one: KICK
action-two: BAN
.# Should AntiCheat block players spamming commands in chat?
command:
block-speed: true
block-repetition: true
.# Valid actions = NONE,KICK,BAN,COMMAND[command]
action-one: KICK
action-two: BAN
system:
.# Turning auto-update off is a BAD idea. You will no longer be protected by the latest hacks/cheats if you do so, and will have to update manually.
auto-update: false
.# Should AntiCheat log ALL failed checks to console?
log-to-console: false
.# Should AntiCheat log to file?
log-to-file: true
.# Should AntiCheat display extra debug information when starting?
verbose-startup: false
.# If silent mode is on, players will not be stopped when they try to hack, and AntiCheat will do everything possible to keep them unaware of their rising hack level.
.# However, alerts will still be sent to console and to admins online, and events will still take place.
silent-mode: false
.# Should ops be exempt from all checks?
exempt-op: false
.# Should AntiCheat track plugins in its own registered events?
event-chains: true
.# Should Enterprise options be enabled? Only set this to true if you're an advanced user.
enterprise: false
.# Use /anticheat check for a list of valid checks
disabled-checks:

• EXAMPLE_CHECK
  disable-in:
• example-world
• example-world-2

For reference - running craftbukkit 1.7.2 R0.2 and spigot 1.7.2 R0.3

I am still unable to replicate the error.