I haven't found a mention in this forum about it so I report it. One of my clients recently noticed that in Photoshop CS6, when you select a font with contextual alternates the calt button looks activated by default (as it should) but in reality the feature it's not activated. You will need to manually deactivate and activate again for the features to start working. It happened with every font with calt features that I tested. Have you also encounter this issue?