Possibly a problem on your end (connection issue), you might not have clicked the button properly. Unless there is a problem with the Spriter that I'm not aware of (very possible), those are the only things that come to mind.
It's my job to help the next generation, and set a good example for them. And for that I'll gladly lay down my life.
Here's what would be your album for your sprites. However it seems there's none saved there.
I'm guessing there's a slight mishap in saving like clicking exit instead on your part.
Don't argue with idiots because they will drag you down to their level and then beat you with experience.
You really should post things like this in the HelpDesk. I've seen quite a few people say the same thing. If the glitch is still occuring, post a question in the helpdesk.