Huben Huben cycling

I have a huben that has never had any problems before. But, yesterday while shooting... after the shot the magazine would not rotate and would just dry fire in the empty chamber. If I rotate the magazine manually it will shoot. But not rotate.
Has anyone had this happen before and is there a relatively easy fix ?? I was using jsb 34grains.
 
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Okay Chard I've a little time now. If your magazine is not rotating the mag advancement is not functioning properly. Ive three k1s one each in .177, .22 and .25. I've probably made every boneheaded mistake you can make but haven't incountered this, probably has to do with parts 43 - 47. just that's where I'd start looking. If all else fails give Kelly a buzz, he has walked me through a couple problems.