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after clicking on HOLD while viewing the order (which by the way is in “Processing” Status) I receive “Error 500 - Internal server error. After going back to the list of orders I see that the status of Order in question changes to Processing, but the Order itself becomes inaccessible.
I’m running Magento ver. 0.7.15480 on 1and1 server.
Go to System -> Cache Control -> check Refress All Cache -> Save cache settings
Go back in Sales -> Orders -> click on order and the page (/magento1/index.php/admin/sales_order/view/order_id/1/) is shown.