- My game crash when i go near a stargate.
You didnt updated the mod server correctly. If you use FTP upload, you must start the game before tryin to upload, because Ark copy the files only when it starts. Just re-upload to server and it will work.

- I cant place any structures, I get the green ghost structure but when I click, nothing happens
One mod in your modlist is not correctly updated, causing all mods after it to be unusable too. Just update the mod if you can find which one is causing this, or update every mods.

- My server dont allow anyone to enter since reboot/update : check if one mod that you were using is not removed from workshop.

- I die when i teleport to my stargate : check that you disabled the shield, shield = kill when not disabled.

- I get teleported above water when tryin to reach the Lost Temple gate : execute this commande as admin => admincheat DestroyAll StarGates_BP_Public_C
It will remove all public gates but will clean the previous version of the temple gate too.

- I cant place the ZPM into the stargate inventory => check that you dont try to put the Jumper zpm, Jumper ZPM is not a regular ZPM.

- If you have server crash issue since v254.0, check on your server files if you have those files : http://puu.sh/tIYeh/dcf1cd819b.png
You must delete the 4 files named : Mat_TheIslandWithMasks*

- The teleporter rings doesnt work => Move one of them a lil bit on the sides, dont place them strict vertical.