Just to see how it's working, I went ahead and tested that the procedure was at least running. I was able to upload the files and import everything properly and in a minute it was reflected. So at least I know something's working properly.
Are you sure you are uploading the right file?
Remember there will be two guildbank.lua files. One of them won't do anything for your characters.
The Right file is in WTF/Accounts/AccountName/SavedVariables/GuildBank.lua
The Wrong file is in Interface/Addons/Guildbank/GuildBank.lua
Are you certain you're uploading the proper file?
If you are for sure uploading the right file, would you mind uploading the file as an attachment to this thread?
---- The day Microsoft makes a product that doesn't suck is the day they make a vacuum cleaner.