Hi guys,
yesterday I played for the first time online and everything was fine.
Today I added two patches (widescreen and trees) and when I start an online match the screen goes black.
Diagnostic says it's all working. The game works offline though.
Any idea/suggestion?

Thanks in advance,
Jean

Widescreen should be the issue, causing a resolution mismatch.

1) Please try the following:

Host a room, go to Game > tick "Start at Single Player menu" ([You must login to view link]).

After doing that, start the game as you normally do. AoC offline window should then pop up, go to Options, adjust the resolution for a lower one and close the game. Now disable the "Start at single player menu" option and launch the game, which should now work properly.

2) If it still doesn't work, check if the Widescreen mod require any modification in your room settings. To do that, search again for the mod and read carefully the information + comments.

Tell me how it went.

Thank you very much. I tried what you said and it’s working.

Great. Enjoy