Complete Category Content Disappears after Adding New Item

**I have been having a problem with my cart recently in that I sometimes add an item to the category, and later look at the store front end and all of the items in that category are no longer there. I go back to the administration panel and they are all still listed. I check to see if they are enabled, and they are. You go back to the front end and nothing. Only the title of the category is there with no items. What is going on? The rest of the category products all display correctly. In fact if I make a new category and move the products there, than that category will completely disappear as well. The big problem is that when this happens, I have to rewrite all the items in brand new adds in a new category or else I am going to lose sales. This becomes a major hassle especially if a category has 20+ items. It takes forever to remedy. :frusty:

Am I missing something simple here, maybe a hidden tab that was depressed by accident- or?
I am completely at a loss on this. :unsure: Any help is appreciated!!! :D **