Happened to me yesterday too. It wasn't just shards but items as well.
Try going into config > Filters. Choose the option to turn everything off, then on, and then hit "reset". just to force everything to refresh. When I did this i had a huge list of drops list in my log, and after that it seemed to start working ok.
(do this in the battle tab too if it doesn't work)
Edited, Sep 5th 2010 2:28pm by RattyBatty
Minecraft : My anti-MMO
Terraria : My anti-Minecraft