Hello. Sorry for the delay on this one. Got buried in a number of active threads lately
Not ideal, but to get rid of the fee in the field... open the field, remove the fees then save. Then open again and uncheck the fee field check, then save. We are aware of the issue where removing both at the same time cause the change to not save. We'll get that addressed, but for now, you can do it as described.
For PayPal, you are most likely experiencing a bug that has been addressed. Make sure you get the latest build installed, which is 2.7.2e. Outside of that, make sure your PayPal IPN settings are done according to our instructions.
If you haven't sorted your Itemid issue yet, I'd like to check that out through a ticket. Thanks.