I'm currently running 220.127.116.11 and I'm utilizing the swatch feature for my product sizes. Simple products tied to a configurable product are set to go to out of stock when they reach qty of 2 or less. Once they get set as out of stock, it removes the size swatch from the configurable page.
Is there a way for it to show the sold out size, but like shaded in grey or crossed out? I found a solution on magento.stackexchange.com, however it was VERY slow. The page would load, then about 3-5 seconds later, it would cross out the sold out sizes.
Having the same issue and have tried everything I can think of. It shows on some products and not on others even though all settings are the same.
As far as I know it doesn't just remove the swatch; it also removes product option. One way to leave product as an option even though it's out of stock is to enable backorders.
probably this extension will solve your issue, a little bit of customisation will be required to add swatches (which is a seperate extension by Fme), please check demo here,