I have a configurable product with 2 simple accosiated products (size 41,42). Two simple product is out of stock but when i enter product page of configurable product i see that has two available option 41 and 42. If i select one of this option and then press add to cart button i get a message such "This product is currently out of stock"
I have check catalog /inventory settings (manage stock, backorder and set out of stock if qnt = 0).
Also i have decache and reindex
Now i use magento 1.9. I think that with 1.7 i havent this problem.