Reset Product Indexer

Hi, for some reason the Product Indexer for Marketpress doesn't seem to refresh. Resulting in quite a bit of empty items.

We did a test previously and imported 24k products to see how much load the system can take, then removed it and put in the actual products of 300++. But even though we've removed it, the Product Indexer doesn't refresh resulting in empty "buy now" links that just leads back to the main site.