It just happened two nights ago - I took all of the shards out of my Stasis Casket to do a round of combining (turns out I only had one combine ready, but I digress) and when I tried to combine - I just get the little tone, and nothing happens.

It happened weeks back as well, but I was eventually able to combine and thought nothing of it again till it happened two nights ago - and then this thread.

It's to do with any and all Shard crafting not shard specific, you press the little hamer to craft the shard and nothing happens you hear the little beep beep for crafting but it doesnt subtrackt credits or give you the new shard , for example i'm currently trying to craft Invictus shard 4 but nothing is happening. 

This looks like an old post if you miss to answer to this one i'll create a new post for you some time soon, thanks.