I applied the 1.4.7 update, and I get this when I try to update an existing product:
1054 Unknown column 'products_weight_type' in 'field list'
It is creating a Feed File.

I was getting that error after the 1.4.5 update, but the suggestion above stopped the error and I was able to update the products, but it would not create a Feed File. Well it created one, but it had nothing in it.