1) Open up app\code\community\TBT\Enhancedgrid\Block\Catalog\Product\Grid.php

2) Goto line 171 and find
private function loadColumnOptions($attr_code) {
$attr = Mage::getModel(’eav/entity_attribute’)->loadByCode(’catalog_product’, $attr_code);
if(sizeof($attr->getData()) > 0) {
if($attr->getFrontendInput() == ’select’) {
$values = Mage::getResourceModel(’eav/entity_attribute_option_collection’)
->setAttributeFilter($attr->getId())
->setStoreFilter($this->_getStore()->getId(), false)

the bold code is what you need to add because the store filter takes the store ID instead of the store object. What happens on the backend is Magento basically takes the value and makes it part of an SQL statement so an object doesn’t really make sense.

Hope this helps anyone stuck with this issue.