Our site www.viart.com site is operated by latest Viart Shop 5 with default Clear design
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VA_PDF error: Alpha channel not supported: images/SuperSmall.png

Usually, this problem occurs when 'PHP-based' library is activated on: https://www.yoursite.com/admin/admin_order_printable.php

The problem is that the 'PHP-based' PDF generation facility in ViArt Shop supports only JPEG images. 'PDF lib based' generation can use JPEG, GIF and PNG images, but will require an installation of a separate PDF library. Please contact your hosting provider about it.

Or just change invoice logo to JPEG format.