i have some kibble and start food in inventory that i cannot rez........others work fine, but these 5 particular items have as creator / owner "teststring pleaseignore"
and a 2006 acquired date [ thats before my time too]
Sounds like it might be a good idea to flush all your cache. Inventory cache, especially, but it probably won't hurt to flush 'em all. Odds are good the 'SL bug' is fixable by making sure your local copy actually matches your actual inventory.