Sounds like the 2 of you are doing exactly what is required to get the mods to work?
Please check to make sure that all of the jsgme files are in the "silent hunter 4 wolves of the pacific" main folder. Please also make sure that the MODS folder is in the "Silent hunter 4 wolves of the pacific" folder. When you place a mod into the MODS folder it needs to be in folder format and not zip/rar'd (but you mentioned you did this). For the green lamp example:
-Extract the greenlamp folder from the .rar file into the MODS folder. When you load up jsgme you should see "greenlamp" on the left (originally). After enabling they should move to the right. When done hit close and start the game up.
Please make sure the mods you are using are compatible with the current version of the game you are running (latest is 1.2).
If you've done exactly this I would recommend hitting the << button to remove all mods and re-enable them. If that doesn't work I think you might need to reinstall since you've done it properly.
Goodluck.