do you mean the reply button vanished, or the post award icon vanished?
if the icon vanished, make sure you set nonzero limits for the post award system for your usergroup (presumably admin)
if youre still having trouble, pm me an admin login
also, anyone interested in the changelog between vbcredits 1.4rc1 and 1.4rc2, its been posted here
http://www.vbcredits.com/forum/showthread.php?t=1177