Interesting. It sounds like the mod either isn't installed correctly, or the data isn't getting stored to the right location.
Try the following.
In-game, type /grss. What happens? Do you get the "Please type /help for help" message, or do you get a huge list of commands? If you get the "/help" message, the Mod isn't installed properly.
Try heading to the Character select screen and click the "Addons" button in the lower left corner, and see if "GuildRaidSnapShot" is in the list and that it's enabled.
Finally, just to be sure, the mod must be installed to the Interface/Addons folder, but you upload from the WTF folder.
Let me know if any of this helps or not.
When I do /grss I get a huge list of commands, the GuildRaidSnapshot mod is installed in my .../interface/addons/ folder, and I upload from the path it says in your tutorial. I am at a loss. I don't know what it could be. I was thinking some sort of problem with other mods I have but when I load it with only grss, it does the same thing.