http://www.sourcemod.net/snapshots.php

Download latest Windows Snapshot for 1.5

Just did that, all other plugins work except for mgemod.
Now it doesn't even get enabled on maps such as mge_training_v7 and nothing happends if i write !add

Issue the following commands with rcon (or without):

sm exts list
sm plugins list

and look for MGEMod and/or SDKHooks to see what errors occur.

It shows no errors at all, it just says its there but it doesnt work

did you updated metamod too?
I updated metamod and sourcemod with the dev snapshots and it worked.

Which snapchot are you using for metamod?

-edit

i used developer branch 1.11.0-hg912 from
http://www.sourcemm.net/snapshots
and it still doesn't work

metamod 1.11.0-hg912-windows
sourcemod 1.6.0-hg4369-windows

L 05/16/2014 - 21:05:46: [SM] Plugin encountered error 15: Array index is out of bounds

Maybe this could be some issue?

When changing the map to one of the mge maps, server console displays the following:

L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 4 spawns on arena Ammomod MGE.
L 05/16/2014 - 21:05:46: [mgemod.smx] Ammomod MGE classes: <scout soldier pyro demoman heavyweapons engi medic sniper spy>
L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 2 spawns on arena Duel_duel.
L 05/16/2014 - 21:05:46: [mgemod.smx] Duel_duel classes: <scout soldier pyro demoman heavyweapons engi medic sniper spy>
L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 2 spawns on arena Directs.
L 05/16/2014 - 21:05:46: [mgemod.smx] Directs classes: <soldier demoman scout>
L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 4 spawns on arena Endif.
L 05/16/2014 - 21:05:46: [mgemod.smx] Endif classes: <soldier demoman>
L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 10 spawns on arena Badlands mid_dirty.
L 05/16/2014 - 21:05:46: [mgemod.smx] Badlands mid_dirty classes: <scout soldier pyro demoman heavyweapons engi medic sniper spy>
L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 7 spawns on arena Gravelpit C.
L 05/16/2014 - 21:05:46: [mgemod.smx] Gravelpit C classes: <scout soldier pyro demoman heavyweapons engi medic sniper spy>
L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 7 spawns on arena Badlands spire.
L 05/16/2014 - 21:05:46: [mgemod.smx] Badlands spire classes: <scout soldier pyro demoman heavyweapons engi medic sniper spy>
L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 10 spawns on arena Trainyard_old.
L 05/16/2014 - 21:05:46: [mgemod.smx] Trainyard_old classes: <scout soldier pyro demoman heavyweapons engi medic sniper spy>
L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 10 spawns on arena Granary_ultimate.
L 05/16/2014 - 21:05:46: [mgemod.smx] Granary_ultimate classes: <scout soldier pyro demoman heavyweapons engi medic sniper spy>
L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 10 spawns on arena Maze.
L 05/16/2014 - 21:05:46: [mgemod.smx] Maze classes: <scout soldier pyro demoman heavyweapons engi medic sniper spy>
[u][b]L 05/16/2014 - 21:05:46: [mgemod.smx] Loaded 10 arenas. MGEMod enabled.[/b][/u]
L 05/16/2014 - 21:05:46: [mgemod.smx] AutoCvar: Setting mp_autoteambalance 0, mp_teams_unbalance_limit 32, & mp_tournament 0
L 05/16/2014 - 21:05:46: [SM] Plugin encountered error 15: Array index is out of bounds
L 05/16/2014 - 21:05:46: [SM] Displaying call stack trace for plugin "mgemod.smx":
L 05/16/2014 - 21:05:46: [SM] [0] Line 436, mgemod.sp::OnMapStart()

When I actually join the server and type !add, nothing happends and this is displayed in console

*DEAD* ÜbêR | MightyMe: !add
L 05/16/2014 - 21:11:08: "ÜbêR | MightyMe<3><STEAM_0:0:19538375><Spectator>" say "!add"
L 05/16/2014 - 21:11:08: [SM] Plugin encountered error 4: Invalid parameter or parameter type
L 05/16/2014 - 21:11:08: [SM] Native "Format" reported: Language phrase "MenuTitle" not found
L 05/16/2014 - 21:11:08: [SM] Displaying call stack trace for plugin "mgemod.smx":
L 05/16/2014 - 21:11:08: [SM] [0] Line 2519, mgemod.sp::ShowMainMenu()
L 05/16/2014 - 21:11:08: [SM] [1] Line 2913, mgemod.sp::Command_Menu()

if you have a tragic.. server, you can re-download their version of metamod (1.10.1-hg876) and sourcemod (1.5.4-hg4051) for the autoinstallers tab in the servercp and it'll work. (at least it did for me)

As I stated in OP, I have a simrai server. I just tried it with the metamod (1.10.1-hg876) and sourcemod (1.5.4-hg4051) but this did not work aswell.

https://github.com/Langeh/MGEMod

Github history shows a change in Mar 2014 for an array out of bounds exception. Not sure how up to date your MGE files are, but I'd say download the latest version from there.

If that still fails, could be try using a 1.6 sourcemod release from that snapshots link earlier posted. Shouldn't have to touch metamod, I highly doubt its related if it's worked for you in the days before the update.

Good luck

EDIT:

Your staketrace showed:
L 05/16/2014 - 21:05:46: [SM] Plugin encountered error 15: Array index is out of bounds
L 05/16/2014 - 21:05:46: [SM] Displaying call stack trace for plugin "mgemod.smx":
L 05/16/2014 - 21:05:46: [SM] [0] Line 436, mgemod.sp::OnMapStart()

Line 436 was the main change in that Mar 2014 update. Doesn't really explain why it this update broke it, but definitely try update MGE.

Thanks. This seemed to have fixed it! Will update OP to show solution

-EDIT-

Aperantly it's not fixed.. Everytime you get killed it takes 10 seconds to respawn and you respawn in a black void...

Get this error now when you get killed or try to change class:

L 05/17/2014 - 14:52:31: [SM] Native "TF2_RegeneratePlayer" reported: Failed to locate function
L 05/17/2014 - 14:52:31: [SM] Displaying call stack trace for plugin "mgemod.smx":
L 05/17/2014 - 14:52:31: [SM] [0] Line 2315, mgemod.sp::ResetPlayer()
L 05/17/2014 - 14:52:31: [SM] [1] Line 4686, mgemod.sp::Timer_ResetPlayer()
L 05/17/2014 - 14:52:55: [SM] Native "TF2_RegeneratePlayer" reported: Failed to locate function
L 05/17/2014 - 14:52:55: [SM] Displaying call stack trace for plugin "mgemod.smx":
L 05/17/2014 - 14:52:55: [SM] [0] Line 3890, mgemod.sp::Event_PlayerDeath()

help

L 05/17/2014 - 14:52:31: [SM] Native "TF2_RegeneratePlayer" reported: Failed to locate function
L 05/17/2014 - 14:52:31: [SM] Displaying call stack trace for plugin "mgemod.smx":
L 05/17/2014 - 14:52:31: [SM] [0] Line 2315, mgemod.sp::ResetPlayer()
L 05/17/2014 - 14:52:31: [SM] [1] Line 4686, mgemod.sp::Timer_ResetPlayer()
L 05/17/2014 - 14:52:55: [SM] Native "TF2_RegeneratePlayer" reported: Failed to locate function
L 05/17/2014 - 14:52:55: [SM] Displaying call stack trace for plugin "mgemod.smx":
L 05/17/2014 - 14:52:55: [SM] [0] Line 3890, mgemod.sp::Event_PlayerDeath()

That indicates that your gamedata is out of date (most likely happened because of the latest update especially if your server is on Windows). Not much you can do except update SourceMod and hope everything works again.

I downgraded sourcemod to 1.50, and then upgraded it back to 1.60 which for some reason fixed it..
MGE works fine now. No issues with spawns what so ever.

Any progress? Is it fixed?

did u read the last post