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When I try to see in the backend "Product Information"/"Related Products" I see this error:
Fatal error: Call to a member function setLinkModel() on a non-object in /XXXXXXXXXX/app/code/core/Mage/Catalog/Model/Product/Link.php on line 105
Same error on the right of the front-end for each products.
It seams that this line return null or false $collection = Mage::getResourceModel('catalog/product_link_product_collection').
Firs try clearing the cache.
If that changes nothing....
Either the file app/code/core/Mage/Catalog/Model/Resource/Product/Link/Product/Collection.php is missing or there is an extension rewriting this model but it does it wrong.
app/code/core/Mage/Catalog/Model/Resource/Product/Link/Product/Collection.php is empty, it existing without any characters. I used Filezilla and its queue to transfer via FTP the latest edition of Magento CE and I can't imagine that some files are empty. Thank you Marius!! Cheers