Cannot save new product in admin (possible bug)

When I tried to create my first new product in a new shop I’m setting up a realized that all the action buttons in the product screen in admin ui are missing. Note that I don’t have any products in the database right now.
After quite a bit of debugging I managed to track the problem to lines [B]235-237[/B] of [B]article_main.tpl[/B]:


                        [{assign var="oPrice" value=$edit->getPrice()}]
                         <em>( [{$oPrice->getBruttoPrice()}] )</em>
                        [{ oxinputhelp ident="HELP_ARTICLE_MAIN_PRICE" }]

If I delete these 3 lines the buttons appear again. It seems that this bit of code is dealing with the price of an existing product so maybe it shouldn’t be executed when creating a new product.
Of course product creation works fine in the demo shop, so I don’t really understand what’s causing the problem in my shop.

Shop version is: CE 4.7.7

Adam, something is apparently damaged in your shop installation. Start to find the problem with oxchkversion first (checks the file consistancey).
http://exchange.oxid-esales.com/OXID-oxid-oxid/Additional-OXID-Extensions/Oxchkversion-3-2-1-Stable-CE-4-7-x.html

Regards