I recently reinstalled my ARK server because it ran into a crashstack after I tried to reinstate a map backup.
Before the crashstack I had used automatic mod updates. Trying to understand the reason for crashing I learned that auto-updating mods might be a bad idea, so I decided to test mods in a single player game and FTP the .mod files and the folders to the server, using "manual update" in the dropdown menu as a setting this time around.
The server starts and the game loads just fine using the files I uploaded from the previous installation, however without any mods at all. Even though I listed them using the web interface field "active mods" ("731604991,1404697612,2179515434,2844898431,1621803973,758620733" in my case) the game does not seem to accept any of them.
Switching to expert mode I realised that that gameusersettings.ini did not contain the mods I entered in the webinterface under "active mods". Instead, the line "activemods" was completely missing in gameusersettings.ini. I then added the line "ActiveMods=731604991,1404697612,2179515434,2844898431,1621803973,758620733" manually, even though I felt a little insecure about the proper location of the line.
Sadly that didn't help - the server would still come online without any of my mods.
Are there any suggestions for further troubleshooting-steps ?