Problem with addition of Price

[TarGG58]

Hello guys,

I have a Problem with the addition of my prices from the Products.
E.g.
I have a Product, costs 15,90 when I select in a custom field "black" it will costs 2 € more.
The Problem its, that the Price didn't change.
In Version 2.0.0 it was alright but since I upgraded to 2.0.1 N and now 2.0.2, the price doesn't change.

Hope you guys can help me.

[TarGG58]

Can no one help me ?

It's not the only problem...i also have a problem after finish an order.

It tells me:
Catchable fatal error: Object of class JDate could not be converted to string in .../administrator/components/com_virtuemart/models/orders.php on line 997

If I choose Paypal there is no problem but the other payment, e.g. cash on delivery or prepayment it shows me this problem.

[TarGG58]

C'mon guys pls help me