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Hmmm, we have a similar problem. Started also this monday. I wonder, because in our case the images has https. Where did you took out the line? file, line? Do you mean in paypalstd.php line 265?
if (empty($this->_method->headerimg) OR $this->_method->headerimg == -1) { $post_variables['image_url'] = $this->getLogoImage(); } else { $post_variables['cpp_header_image'] = JURI::base() . 'images/stories/virtuemart/payment/' . $this->_method->headerimg; }