Minor Bug: payment processing

[oldrock]

On return to the store from PayPal the "Thanks for your payment" screen at
.../index.php?option=com_virtuemart&page=checkout.result&order_id=10
has a missing image:
.../components/com_virtuemart/shop_image/ps_image/button_ok.png

Virtuemart 1.1 rev 1267, Joomla 1.5.1 Stable; mysql Ver 12.22 Distrib 4.0.16; PHP 4.4.1; FreeBSD 4.11 stable.