When the culture of the site is set to nb-NO then the following error is displayed if a payment 2.0 part added to the site:
Default content NOT loaded. [Error while importing Content: Webforms Donation Form. [Error creating part. Conversion from string "0.000000" to type 'Decimal' is not valid.. [Conversion from string "0.000000" to type 'Decimal' is not valid.]]] Click here for details
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.