OK that is rather odd, DB errors typically show up straight away and I have been running this for months.
Couple of questions:
1) Does this error always occur?
2) Do you have a table prefix and if so what is it?
3) If you look at your db with phpmyadmin do you see a subscribeforum table
4) Does the default VB forum subscription system work? i.e. can you subscribe and unsibscribe to a forum and are you active subs listed in User CP
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