When I combine Shards on the Shard Crafting panel, the first combine works fine. Subsequent combines attempts make the sound effect when I click the hammer button but do not debit credits, do not make the new shard, do not debit the stack of lesser shards.
If I take a mission then play it or abort it , once back to the Command Bridge I can do one combine, but subsequent combines fail in the same way.
If I quit out to the Character Selection screen then go back to the Command Bridge, I can do one combine, but subsequent combines fail in the same way. This method is the quickest workaround , but still tedious.
I'm playing via Steam on PC.