I have worked around this issue by commenting out the following lines (43-48) in admin>includes>modules>update_product.php.
Code:
'products_weight_type' => $products_weight_type,
'products_dim_type' => $products_dim_type,
'products_length' => (float)zen_db_prepare_input($_POST['products_length']),
'products_width' => (float)zen_db_prepare_input($_POST['products_width']),
'products_height' => (float)zen_db_prepare_input($_POST['products_height']),
'products_ready_to_ship' => (int)zen_db_prepare_input($_POST['products_ready_to_ship']),
It worked for me! :)
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