Welcome to Technical Support. Please create your own thread, provide the crashing information as explained at the 1.6 mod page and upload your recorded game(s) and provide the list of CIVs. Thank you.

Guys stop blaming this on people combining 1.5 and 1.6. This is not the issue.
Had the issue again twice and can 100% confirm it was 1.6 patch and 1.6 mod.

civs:

game 1: vikings, vietnamese, magyars, bengalis, gurjaras, koreans, tatars, goths
game 2: ethiopians slavs hindustanis mayans, spanish gurjaras, bengalis, lithuanians

No one is blaming anything on anyone. We just want to avoid incompatible patch configurations.

Trying to figure out OOS issues is like finding a needle in a haystack. We need as much information as possible and simply want to rule out obvious mistakes. There are plenty of matches played with 1.5 RC and 1.6 gamedata.

What currently helps us are as many reports as possible to spot commonalities, e. g. which civ could be affeted, which technology could be affected, whih action could be affected and causing the game going out of sync. Thank you for your understanding.

hi Sickle , can you go to : Age of Empires II\Voobly Mods\AOC\Patches\v1.6 RC
and screen shoot your folder please?

Ayer jugando me pasó lo mismo, 4vs4 en Nomada con 1.6 (bien configurada la sala) y la partida se desincronizó en Imperial (osea con el game bastante avanzado)
estaba jugando una de mis mejores partidas matando a varios y pasa esto... jajaja 24
Civilizaciones: Gurjaras, Etiopes, Sarracenos, Cumanos, Sicilianos, Celtas, Bengalies, Godos.
Por las dudas recomiendo revisar la mejora del caballero gurjara (Shrivamsha), creo habia mandado a hacer esa mejora nose si tendra algo que ver o no. Por cierto, dicha unidad no aparece en el arbol tecnologico, estaria bueno lo agreguen ya que es una unidad nueva y rara, es dificil para los nuevos saber que hacer contra esa unidad sino lo tienes en el arbol de tecnologias.
Tampoco esta en el arbol tecnologico la Milicia Flamenca (borgoñones) y el barco Thirisadai (dravidicos), Camello llameante (tartaros), estaria bueno agregar todo eso al arb. de tecnologias y de paso revisar capaz algun bug de error de sincronización tenga que ver con algo de eso.
Igual el principal problema del 1.6 es que por alguna razón a algunos jugadores que el 1.5 les anda perfecto el 1.6 les da lag.
Por cierto, me paso varias veces specteando partida 1.6 que al abrir arb. de tecnologias me cierra el game. Hoy viendo una repeteción me pasó 3 veces seguidas (con gurjaras)

screenshot of folder attached

happened again
confirmed 1.6 patch+mod
player out of sync: diegoeh87
civs: khmer, goths, franks, vikings, burgundians, aztecs, chinese, bulgarians

happened again
confirmed 1.6 patch+mod
player out of sync: Extreme77
civs: Magyars, Slavs, Khmer, Gurjaras, Bohemians, Berbers, Bengalis, Byzantines

Are some players using de graphics and some using classic graphics?
Could that be the problem?

diegoeh87 and Extreme77 look like they never have rated in 1.6RC game. I saw the record game all outsync is due to 1.6RC new civ bonus (poles geting gold when mining stone, bengalis trade bonus,bengalis trade cart, celts castlel healing stronghold ...).
i suspect their anti virus delete patch and they playing 1.5 RC with 1.6 RC player.
i think voobly will release new version of patch that will avoid that bug.

Extreme77 say he uses classic, but otherwise I dunno.

Problem seems to be with the patch since he can play 1.5 RC + 1.6 data mod with no problem.

There could be an issue with missing files due to false positive detections by Microsoft Windows Defender. Please be patient until we figured it out, as this takes some time — between job, family and other real life issues. Thank you for understanding.

I'm willing to be patient but people are already becoming less and less willing to play 1.6..

Actually something is broken, it's not possible to play 1.6 right now. We will deploy a fix for this soon. Sorry guys.