exactly the same problem with me. I have two user accounts on my computer (work/private) and as soon as I change the user BTT does not work anymore - I get the message: "Bettertouchtool is currently disabled".
I can activate it, but then BTT is disabled again for the other user.
I have imported the license on both user accounts - no satisfactory result.
I also created a /Library/Application Support/BetterTouchTool folder manually and copied the license file into that - no satisfactory result.
Is there no way to activate the licences for multi user at one mac?